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Zajc Avramovic M, Avcin T. Antiphospholipid syndrome in children. Best Pract Res Clin Rheumatol 2024:101986. [PMID: 39138042 DOI: 10.1016/j.berh.2024.101986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 05/22/2024] [Accepted: 07/18/2024] [Indexed: 08/15/2024]
Abstract
Antiphospholipid syndrome (APS) in children is a rare disease associated with significant morbidity and mortality. In comparison with APS in adults, pediatric APS has a more severe presentation with frequent recurrences of thrombotic events and a higher probability of life-threatening catastrophic APS. Nonthrombotic manifestations are also more common in the pediatric age group and can precede thrombosis. New classification criteria have been introduced recently and have not yet been assessed in pediatric patients with APS. In addition to anticoagulation drugs, other novel therapies have emerged including the use of B cell and complement inhibitors, especially in catastrophic APS. The purpose of this review is to provide a broad overview of aPL-related clinical manifestations in pediatric patients based on the analysis of published cohorts and data from the international pediatric APS registry. We also aim to illustrate APS in infants caused by transplacentally transferred maternal aPL, which is very rarely associated with acute thrombotic events in the perinatal period and more frequently with long-term neurodevelopmental abnormalities.
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Affiliation(s)
- Mojca Zajc Avramovic
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Center Ljubljana, Slovenia; Department of Pediatrics, Faculty of Medicine, University of Ljubljana, Slovenia.
| | - Tadej Avcin
- Department of Allergology, Rheumatology and Clinical Immunology, University Children's Hospital, University Medical Center Ljubljana, Slovenia; Department of Pediatrics, Faculty of Medicine, University of Ljubljana, Slovenia.
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Radin M, Cecchi I, Arbrile M, Montin D, Farinasso L, Cioffi M, Foddai SG, Barinotti A, Menegatti E, Baldovino S, Sciascia S, Roccatello D. Pediatric Presentation of Antiphospholipid Syndrome: A Review of Recent Literature With Estimation of Local Prevalence. Semin Thromb Hemost 2024; 50:182-187. [PMID: 36940717 DOI: 10.1055/s-0043-1764472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
We aimed to investigate the epidemiology, the clinical and laboratory characteristics of the pediatric involvement of antiphospholipid syndrome (APS), by performing a review of the current evidence and reviewing local experience in the Northwest Italy. To achieve this, we performed a detailed literature search to identify articles describing clinical and laboratory characteristics of pediatric APS. In concomitance, we conducted a registry-based study collecting data from the Piedmont and Aosta Valley Rare Disease Registry including pediatric patients diagnosed with APS in the last 11 years. The literature review led to inclusion of six articles with a total of 386 pediatric patients (65% females, 50% with systemic lupus erythematosus (SLE) as concomitant diagnosis). Rates of venous and arterial thrombosis were 57 and 35%, respectively. "Extra-criteria manifestations" included mostly hematologic and neurologic involvement. Almost one-quarter of patients (19%) reported recurrent events and 13% manifested as catastrophic APS. A total of 17 pediatric patients (mean age 15.1 ± 2.8, 76% female) developed APS in the Northwest of Italy. In 29% of cases, SLE was a concomitant diagnosis. Deep vein thrombosis was the most frequent manifestation (28%) followed by catastrophic APS (6%). The estimated prevalence of pediatric APS in Piedmont and Aosta Valley Region is 2.5/100,000 people, whereas the estimated annual incidence is 0.2/100,000 inhabitants. In conclusion, clinical manifestations of pediatric APS seem to be more severe and with a high prevalence of noncriteria manifestations. International efforts are needed to better characterize this condition and to develop new specific diagnostic criteria to avoid missed/delayed diagnosis in children with APS.
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Affiliation(s)
- Massimo Radin
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
- Nephrology and Dialysis, Department of Clinical and Biological Sciences, S. Giovanni Bosco Hospital and University of Turin, Italy
- Department of Clinical and Biological Sciences, School of Specialization of Clinical Pathology, University of Turin, Turin, Italy
| | - Irene Cecchi
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
- Nephrology and Dialysis, Department of Clinical and Biological Sciences, S. Giovanni Bosco Hospital and University of Turin, Italy
- Department of Clinical and Biological Sciences, School of Specialization of Clinical Pathology, University of Turin, Turin, Italy
| | - Marta Arbrile
- Department of Clinical and Biological Sciences, School of Specialization of Clinical Pathology, University of Turin, Turin, Italy
| | - Davide Montin
- Department of Public Health and Pediatrics, University of Turin, Pediatria Specialistica U, "Regina Margherita" Children Hospital, Turin, Italy
| | - Loredana Farinasso
- Department of Public Health and Pediatrics, University of Turin, Pediatria Specialistica U, "Regina Margherita" Children Hospital, Turin, Italy
| | - Michele Cioffi
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
| | - Silvia Grazietta Foddai
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
| | - Alice Barinotti
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
| | - Elisa Menegatti
- Department of Clinical and Biological Sciences, School of Specialization of Clinical Pathology, University of Turin, Turin, Italy
| | - Simone Baldovino
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
- Nephrology and Dialysis, Department of Clinical and Biological Sciences, S. Giovanni Bosco Hospital and University of Turin, Italy
- Department of Clinical and Biological Sciences, School of Specialization of Clinical Pathology, University of Turin, Turin, Italy
| | - Savino Sciascia
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
- Nephrology and Dialysis, Department of Clinical and Biological Sciences, S. Giovanni Bosco Hospital and University of Turin, Italy
| | - Dario Roccatello
- Department of Clinical and Biological Sciences, Center of Research of Immunopathology and Rare Diseases-Coordinating Center of Piemonte and Aosta Valley Network for Rare Diseases, University of Turin, S. Giovanni Bosco Hospital, Turin, Italy
- Nephrology and Dialysis, Department of Clinical and Biological Sciences, S. Giovanni Bosco Hospital and University of Turin, Italy
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Amoura Z, Bader-Meunier B, Bal Dit Sollier C, Belot A, Benhamou Y, Bezanahary H, Cohen F, Costedoat-Chalumeau N, Darnige L, Drouet L, Elefant E, Harroche A, Lambert M, Martin T, Martin-Toutain I, Mathian A, Mekinian A, Pineton De Chambrun M, de Pontual L, Wahl D, Yelnik C, Zuily S. French National Diagnostic and Care Protocol for antiphospholipid syndrome in adults and children. Rev Med Interne 2023; 44:495-520. [PMID: 37735010 DOI: 10.1016/j.revmed.2023.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 08/29/2023] [Indexed: 09/23/2023]
Abstract
Antiphospholipid syndrome (APS) is a chronic autoimmune disease involving vascular thrombosis and/or obstetric morbidity and persistent antibodies to phospholipids or certain phospholipid-associated proteins. It is a rare condition in adults and even rarer in children. The diagnosis of APS can be facilitated by the use of classification criteria based on a combination of clinical and biological features. APS may be rapidly progressive with multiple, often synchronous thromboses, resulting in life-threatening multiple organ failure. This form is known as "catastrophic antiphospholipid syndrome" (CAPS). It may be primary or associated with systemic lupus erythematosus (associated APS) and in very rare cases with other systemic autoimmune diseases. General practitioners and paediatricians may encounter APS in patients with one or more vascular thromboses. Because APS is so rare and difficult to diagnosis (risk of overdiagnosis) any suspected case should be confirmed rapidly and sometimes urgently by an APS specialist. First-line treatment of thrombotic events in APS includes heparin followed by long-term anticoagulation with a VKA, usually warfarin. Except in the specific case of stroke, anticoagulants should be started as early as possible. Any temporary discontinuation of anticoagulants is associated with a high risk of thrombosis in APS. A reference/competence centre specialised in autoimmune diseases must be urgently consulted for the therapeutic management of CAPS.
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Affiliation(s)
- Z Amoura
- Department of Internal Medicine, Institut E3M, CIMI-Paris, Faculty of medicine, National Reference Centre of Systemic Lupus, antiphospholipid syndrome, and other autoimmune diseases, Sorbonne University, AP-HP, Pitié Salpêtrière, boulevard de l'Hôpital, 75013 Paris, France.
| | - B Bader-Meunier
- Laboratory of Immunogenetics of Paediatric Autoimmune Diseases, Institute Imagine, University Paris Cité, Paris, France
| | - C Bal Dit Sollier
- Thrombosis and atherosclerosis research unit, vessels and blood institute (IVS), anticoagulation clinic (CREATIF), Lariboisière hospital, AP-HP, 75010 Paris, France
| | - A Belot
- Department of Pediatric Nephrology, Rheumatology, Dermatology, Reference Centre for Rheumatic, AutoImmune and Systemic diseases in children (RAISE), hôpital femme mère enfant, CHU de Lyon, Bron, France
| | - Y Benhamou
- National Reference Centre of MicroAngiopathies Thrombotic, Paris, France; Department of Internal Medicine, University Hospital of Rouen, Normandie University, Rouen, France
| | - H Bezanahary
- Department of Internal Medicine and Clinical Immunology, centre hospitalier universitaire de Limoges, Limoges, France
| | - F Cohen
- Department of Internal Medicine, Institut E3M, CIMI-Paris, Faculty of medicine, National Reference Centre of Systemic Lupus, antiphospholipid syndrome, and other autoimmune diseases, Sorbonne University, AP-HP, Pitié Salpêtrière, boulevard de l'Hôpital, 75013 Paris, France
| | - N Costedoat-Chalumeau
- Department of Internal Medicine, Referral Centre for Rare Autoimmune and Systemic Diseases of Île-de-France, AP-HP, Cochin Hospital, Paris, France; Centre for Epidemiology and Statistics, Institut national de la santé et de la recherche médicale, French National Institute for Agricultural Research, University Paris Cité, Paris, France
| | - L Darnige
- Biological Hematology Department, Assistance publique-Hôpitaux de Paris, hôpital européen Georges-Pompidou, Inserm, UMR-S1140, Innovative Therapies in Haemostasis, Paris, France
| | - L Drouet
- Thrombosis and atherosclerosis research unit, vessels and blood institute (IVS), anticoagulation clinic (CREATIF), Lariboisière hospital, AP-HP, 75010 Paris, France
| | - E Elefant
- Reference Center for Teratogenic Agents, hôpital Armand-Trousseau centre de référence sur les agents tératogènes, Île-de-France, Paris, France
| | - A Harroche
- Department of Hematology, Haemophilia Treatment Centre, University Hospital Necker Enfants Malades, Paris, France
| | - M Lambert
- Department of Internal Medicine and Clinical immunology, Reference Centre of Autoimmune Systemic Rare Diseases Of North And North-West of France (CeRAINO), U1167 RID-AGE, Lille University, Inserm, University hospital of Lille, 59000 Lille, France
| | - T Martin
- Department of Internal Medicine and Clinical Immunology, Strasbourg University Hospital, Strasbourg, France
| | - I Martin-Toutain
- Resource and Competence Centre for Haemorrhagic Diseases, Hospital Center of Versailles André-Mignot, Le Chesnay, France
| | - A Mathian
- Department of Internal Medicine, Institut E3M, CIMI-Paris, Faculty of medicine, National Reference Centre of Systemic Lupus, antiphospholipid syndrome, and other autoimmune diseases, Sorbonne University, AP-HP, Pitié Salpêtrière, boulevard de l'Hôpital, 75013 Paris, France
| | - A Mekinian
- Department of Internal Medicine and Inflammation-Immunopathology-Biotherapy (DMU i3), Saint-Antoine Hospital, Sorbonne University, AP-HP, 75012 Paris, France
| | - M Pineton De Chambrun
- Department of Internal Medicine, Institut E3M, CIMI-Paris, Faculty of medicine, National Reference Centre of Systemic Lupus, antiphospholipid syndrome, and other autoimmune diseases, Sorbonne University, AP-HP, Pitié Salpêtrière, boulevard de l'Hôpital, 75013 Paris, France
| | - L de Pontual
- Department of Paediatrics, Jean-Verdier Hospital, AP-HP, HUPSSD, 93140 Bondy, France
| | - D Wahl
- Vascular Medicine Division and Regional Competence Centre for Rare Vascular and Systemic Autoimmune Diseases, CHRU de Nancy, Nancy, France
| | - C Yelnik
- Department of Internal Medicine and Clinical immunology, Reference Centre of Autoimmune Systemic Rare Diseases Of North And North-West of France (CeRAINO), U1167 RID-AGE, Lille University, Inserm, University hospital of Lille, 59000 Lille, France
| | - S Zuily
- Vascular Medicine Division and Regional Competence Centre for Rare Vascular and Systemic Autoimmune Diseases, CHRU de Nancy, Nancy, France
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Theron A, Ayadi S, Boissier E, Dautremay O, Schved JF, Sirvent N, Diaz I, Captier G, Biron-Andreani C, Jeziorski E. Post-viral idiopathic purpura fulminans is associated with inherited thrombophilia and anti-cardiolipin antibodies. Front Pediatr 2023; 11:1197795. [PMID: 37325350 PMCID: PMC10265742 DOI: 10.3389/fped.2023.1197795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 05/16/2023] [Indexed: 06/17/2023] Open
Abstract
Introduction Idiopathic purpura fulminans (IPF) is a rare and severe coagulation disorder, associated with transient anti-protein S (anti-PS) antibodies in the context of post-viral infection such as varicella. Anti-protein S antibodies are frequently found in the context of varicella, in contrast with the rarity of IPF. Other factors such as anti-phospholipid antibodies (APL) and inherited thrombophilia may be associated with severe vascular complication. Method This is an ancillary study of a French multicenter retrospective series and systematic review of literature. We analyzed patients who were tested for inherited thrombophilia, namely antithrombin, protein C, protein S deficiency; prothrombin gene G20210A polymorphism (FII:G20210A),Factor V R506Q polymorphism (FV:R506Q); and/or for APL (lupus anticoagulant (LA), anti-cardiolipin antibodies (ACL), or anti-beta 2-GPI antibodies (Aβ2GP1). Results Among the 25 patients tested for inherited thrombophilia, 7 (28%) had positive results. Three had FV R506Q, two FII:G20210A, one compound heterozygote FV:R506Q associated to FII:G20210A, and one protein C deficiency. APL testing was performed in 32 patients. It was positive in 19 patients (59%): 17 ACL (53%), 5 LA (16%), 4 Aβ2GP1 (13%). The risk of severe complications was not associated with presence of inherited thrombophilia or APL presence, with RR: 0.8 [95% CI: 0.37-1.71], p = 1 and RR: 0.7 [95% CI: 0.33-1.51], p = 0.39, respectively. We found a high prevalence of inherited thrombophilia or APL in a population of patients with IPF. However, we do not find an association with the occurrence of severe vascular complications or venous thromboembolism.
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Affiliation(s)
- A. Theron
- Department of Pediatric Oncology and Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
- Hemophilia Treatment Center, Montpellier, France
- IRMB, University of Montpellier, INSERM, Montpellier, France
| | - S. Ayadi
- Department of Pediatric Oncology and Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - E. Boissier
- Laboratory of Hematology, University Hospital, Nantes, France
| | - O. Dautremay
- Biology Laboratory, Charleville-Mézières, France
- Department of Biological Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - J.-F. Schved
- Department of Biological Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - N. Sirvent
- Department of Pediatric Oncology and Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - I. Diaz
- Department of Biological Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - G. Captier
- Department of Plastic, Reconstructive and Aesthetic Surgery, CHU de Montpellier, University of Montpellier, Montpellier, France
- LIRMM, CNRS-University of Montpellier, Montpellier, France
| | - C. Biron-Andreani
- Hemophilia Treatment Center, Montpellier, France
- Department of Biological Hematology, CHU de Montpellier, University of Montpellier, Montpellier, France
| | - E. Jeziorski
- Department of Pediatric Infectious Diseases and Immunology, CHU de Montpellier, University of Montpellier, Montpellier, France
- PCCEI, CeRéMAIA, CHU de Montpellier, University Montpellier, Montpellier, France
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Mahmud SA, Bullock DR, Correll CK, Hobday PM, Riskalla MM, Vehe RK, Binstadt BA. Non-criteria antiphospholipid antibodies and pediatric rheumatic disease: a case series. Pediatr Rheumatol Online J 2022; 20:70. [PMID: 35987646 PMCID: PMC9392300 DOI: 10.1186/s12969-022-00732-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 08/15/2022] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND Non-criteria antiphospholipid antibodies (NC-aPL) are a relatively undefined subgroup of antiphospholipid antibodies (aPL). Knowledge about NC-aPL in adults is limited and even less is known in pediatric patients. Routine tests for antiphospholipid syndrome (APS)-a clinical state marked by the presence of aPL in association with vascular thrombosis-usually include lupus anticoagulant (LAC), anti-cardiolipin (aCL) and -beta-2 glycoprotein I (aβ2GPI). LAC is a functional screen for prothrombotic aPL, while the latter tests identify specific autoantibodies. Specific targets of NC-aPL include, but are not limited to, phosphatidylethanolamine, phosphatidylserine, and prothrombin. PRESENTATION OF CASES We present single-center data from eight pediatric patients with NC-aPL identified during a three-year period. All patients had presenting features raising suspicion for APS. Most patients were female with a primary rheumatic disease. One patient had a stroke. Another patient had alveolar hemorrhage and pulmonary hypertension. Raynaud's phenomenon, rashes involving distal extremities, and headaches were common. Most patients had a positive LAC, yet their routine aPL tests were negative, prompting testing for NC-aPL. CONCLUSIONS Our findings suggest NC-aPL are associated with typical signs and symptoms of APS in pediatric patients. Pediatricians and pediatric subspecialists should consider NC-aPL when clinical suspicion is high and routine aPL tests are negative, particularly when LAC is positive. While guidelines for NC-aPL do not yet exist for children or adults, these autoantibodies have pathogenic potential. Actionable items could include evaluation for the presence of other (primary) rheumatic diseases, and consultation with hematologists and/or obstetricians regarding anticoagulation/platelet inhibition and thrombosis education. Future guidelines regarding NC-aPL will only be generated by gathering more data, ideally prospectively.
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Affiliation(s)
- Shawn A. Mahmud
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA ,grid.17635.360000000419368657Center for Immunology, University of Minnesota, Minneapolis, MN USA
| | - Danielle R. Bullock
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA
| | - Colleen K. Correll
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA
| | - Patricia M. Hobday
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA
| | - Mona M. Riskalla
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA
| | - Richard K. Vehe
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA
| | - Bryce A. Binstadt
- grid.17635.360000000419368657Department of Pediatrics, Division of Pediatric Rheumatology, Allergy & Immunology, University of Minnesota, AO-10 Academic Office Building, 2414 S. 7th Street, Minneapolis, MN USA ,grid.17635.360000000419368657Center for Immunology, University of Minnesota, Minneapolis, MN USA
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Sloan EE, McCurdy D. The Antiphospholipid Syndrome in the Pediatric Population. Adv Pediatr 2022; 69:107-121. [PMID: 35985703 DOI: 10.1016/j.yapd.2022.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Pediatric antiphospholipid syndrome (APS) is characterized by autoantibodies directed against protein complexes on cellular membranes and leads to a prothrombotic, proinflammatory state. A child with APS may present with venous, arterial, or small vessel thrombosis. Other manifestations of APS include nonthrombotic manifestations, such as hematologic and neurologic symptoms. APS may be a primary condition or related to other autoimmune diseases. If APS-related thrombosis is unrecognized, the child may suffer recurrent thrombotic events after the withdrawal of anticoagulation. Thus, it is important to consider APS as a cause of thrombosis in children. Appropriate testing confirms the diagnosis and directs further care.
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Affiliation(s)
- Elizabeth E Sloan
- Department of Pediatrics, Division of Rheumatology, University of Texas Southwestern Medical Center, Scottish Rite for Children and Children's Medical Center Dallas, 2222 Welborn Street, Dallas, TX 75219, USA.
| | - Deborah McCurdy
- Department of Pediatrics, Division of Allergy/Immunology/Rheumatology, David Geffen School of Medicine, UCLA, Mattel Children's Hospital, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
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