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Engelen M, van Ballegoij WJC, Mallack EJ, Van Haren KP, Köhler W, Salsano E, van Trotsenburg ASP, Mochel F, Sevin C, Regelmann MO, Tritos NA, Halper A, Lachmann RH, Davison J, Raymond GV, Lund TC, Orchard PJ, Kuehl JS, Lindemans CA, Caruso P, Turk BR, Moser AB, Vaz FM, Ferdinandusse S, Kemp S, Fatemi A, Eichler FS, Huffnagel IC. International Recommendations for the Diagnosis and Management of Patients With Adrenoleukodystrophy: A Consensus-Based Approach. Neurology 2022; 99:940-951. [PMID: 36175155 PMCID: PMC9687408 DOI: 10.1212/wnl.0000000000201374] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 08/23/2022] [Indexed: 11/15/2022] Open
Abstract
Pathogenic variants in the ABCD1 gene cause adrenoleukodystrophy (ALD), a progressive metabolic disorder characterized by 3 core clinical syndromes: a slowly progressive myeloneuropathy, a rapidly progressive inflammatory leukodystrophy (cerebral ALD), and primary adrenal insufficiency. These syndromes are not present in all individuals and are not related to genotype. Cerebral ALD and adrenal insufficiency require early detection and intervention and warrant clinical surveillance because of variable penetrance and age at onset. Newborn screening has increased the number of presymptomatic individuals under observation, but clinical surveillance protocols vary. We used a consensus-based modified Delphi approach among 28 international ALD experts to develop best-practice recommendations for diagnosis, clinical surveillance, and treatment of patients with ALD. We identified 39 discrete areas of consensus. Regular monitoring to detect the onset of adrenal failure and conversion to cerebral ALD is recommended in all male patients. Hematopoietic cell transplant (HCT) is the treatment of choice for cerebral ALD. This guideline addresses a clinical need in the ALD community worldwide as the number of overall diagnoses and presymptomatic individuals is increasing because of newborn screening and greater availability of next-generation sequencing. The poor ability to predict the disease course informs current monitoring intervals but remains subject to change as more data emerge. This knowledge gap should direct future research and illustrates once again that international collaboration among physicians, researchers, and patients is essential to improving care.
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Affiliation(s)
- Marc Engelen
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam.
| | - Wouter J C van Ballegoij
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Eric James Mallack
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Keith P Van Haren
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Wolfgang Köhler
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Ettore Salsano
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - A S P van Trotsenburg
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Fanny Mochel
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Caroline Sevin
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Molly O Regelmann
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Nicholas A Tritos
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Alyssa Halper
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Robin H Lachmann
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - James Davison
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Gerald V Raymond
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Troy C Lund
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Paul J Orchard
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Joern-Sven Kuehl
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Caroline A Lindemans
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Paul Caruso
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Bela Rui Turk
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Ann B Moser
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Frédéric M Vaz
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Sacha Ferdinandusse
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Stephan Kemp
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Ali Fatemi
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Florian S Eichler
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
| | - Irene C Huffnagel
- From the Department of Pediatric Neurology/Emma Children's Hospital (M.E., W.J.C.B., I.C.H.), Amsterdam UMC, Amsterdam Leukodystrophy Center, University of Amsterdam, the Netherlands; Division of Child Neurology (E.J.M.), Department of Pediatrics, Weill Cornell Medicine/NewYork-Presbyterian Hospital, NY; Department of Neurology & Pediatrics/Lucile Packard Children's Hospital (K.P.V.H.), Stanford University School of Medicine, Palo Alto, CA 4. Department of Neurology, Leukodystrophy Clinic, University of Leipzig Medical Center, Germany; Unit of Rare Neurodegenerative and Neurometabolic Diseases (E.S.), Fondazione IRCCS Istituto Neurologico C. Besta, Milano, Italy; Department of Pediatric Endocrinology/Emma Children's Hospital (A.S.P.T.), Amsterdam UMC, University of Amsterdam, the Netherlands; AP-HP (F.M.), Department of Medical Genetics, Reference Center for Adult Neurometabolic Diseases and Leukodystrophies, and INSERM U 1127, CNRS UMR 7225, Paris Brain Institute, La Pitié-Salpêtrière University Hospital, Paris, France; Department of Pediatric Neurology/Hôpital Bicêtre Paris Sud (C.S.), France, Reference Center for Children Leukodystrophies Inserm U1127, ICM-Hôpital Pitié Salpêtrière, Paris, France; Division of Pediatric Endocrinology and Diabetes (M.O.R.), Children's Hospital at Montefiore, Albert Einstein College of Medicine of Medicine, Bronx, NY; Neuroendocrine Unit (N.A.T.), Massachusetts General Hospital, Boston, MA; Harvard Medical School (N.A.T.), Boston, MA; Division of Pediatric Endocrinology (A.H.), Department of Pediatrics, Massachusetts General Hospital, Boston, MA, and Harvard Medical School (A.H.), Boston, MA; Charles Dent Metabolic Unit (R.H.L.), National Hospital for Neurology and Neurosurgery, London, United Kingdom; Metabolic Medicine (J.D.), Great Ormond Street Hospital for Children, London United Kingdom; Department of Genetic Medicine (G.V.R.), Johns Hopkins, Baltimore, MD; Division of Pediatric Blood and Marrow Transplantation & Cellular Therapy (T.L., P.J.O.), University of Minnesota, Minneapolis; Pediatric Oncology (J.-S.K.), Hematology, Hemostaseology, University Hospital Leipzig, Germany; Pediatric Blood and Bone Marrow Transplantation (C.A.L.), Princess Maxima Center Utrecht, the Netherlands; Department of Pediatrics (C.A.L.), Wilhemina Children's Hospital, UMC Utrecht, Utrecht University, the Netherlands; Director of Pediatric Neuroimaging (P.C.), Lenox Hill Radiology and Medical Imaging Associates, New York, NY; Moser Center for Leukodystrophies (B.R.T., A.F.), Kennedy Krieger Institute, Johns Hopkins Medical Institutions, Baltimore, MD; Department of Neurogenetics (A.B.M.), Kennedy Krieger Institute, Baltimore, MD; Laboratory Genetic Metabolic Diseases (F.M.V., S.F., S.K.), Department of Clinical Chemistry and Pediatrics, Amsterdam UMC, Amsterdam Gastroenterology Endocrinology Metabolism, University of Amsterdam, the Netherlands; and Department of Neurology (F.S.E.), Massachusetts General Hospital, Boston, MA. Dr. van Ballegoij is currently at the Department of Neurology, Zaans Medisch Centrum, Zaandam
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