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Wu J, Ye S, Liu X, Xu Y, Fan D. The burden of upper motor neuron involvement is correlated with the bilateral limb involvement interval in patients with amyotrophic lateral sclerosis: a retrospective observational study. Neural Regen Res 2025; 20:1505-1512. [PMID: 39075916 DOI: 10.4103/nrr.nrr-d-23-01359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 01/12/2024] [Indexed: 07/31/2024] Open
Abstract
JOURNAL/nrgr/04.03/01300535-202505000-00032/figure1/v/2024-07-28T173839Z/r/image-tiff Amyotrophic lateral sclerosis is a rare neurodegenerative disease characterized by the involvement of both upper and lower motor neurons. Early bilateral limb involvement significantly affects patients' daily lives and may lead them to be confined to bed. However, the effect of upper and lower motor neuron impairment and other risk factors on bilateral limb involvement is unclear. To address this issue, we retrospectively collected data from 586 amyotrophic lateral sclerosis patients with limb onset diagnosed at Peking University Third Hospital between January 2020 and May 2022. A univariate analysis revealed no significant differences in the time intervals of spread in different directions between individuals with upper motor neuron-dominant amyotrophic lateral sclerosis and those with classic amyotrophic lateral sclerosis. We used causal directed acyclic graphs for risk factor determination and Cox proportional hazards models to investigate the association between the duration of bilateral limb involvement and clinical baseline characteristics in amyotrophic lateral sclerosis patients. Multiple factor analyses revealed that higher upper motor neuron scores (hazard ratio [HR] = 1.05, 95% confidence interval [CI] = 1.01-1.09, P = 0.018), onset in the left limb (HR = 0.72, 95% CI = 0.58-0.89, P = 0.002), and a horizontal pattern of progression (HR = 0.46, 95% CI = 0.37-0.58, P < 0.001) were risk factors for a shorter interval until bilateral limb involvement. The results demonstrated that a greater degree of upper motor neuron involvement might cause contralateral limb involvement to progress more quickly in limb-onset amyotrophic lateral sclerosis patients. These findings may improve the management of amyotrophic lateral sclerosis patients with limb onset and the prediction of patient prognosis.
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Affiliation(s)
- Jieying Wu
- Department of Neurology, Peking University Third Hospital, Beijing, China
- Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases, Beijing, China
| | - Shan Ye
- Department of Neurology, Peking University Third Hospital, Beijing, China
- Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases, Beijing, China
| | - Xiangyi Liu
- Department of Neurology, Peking University Third Hospital, Beijing, China
- Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases, Beijing, China
| | - Yingsheng Xu
- Department of Neurology, Peking University Third Hospital, Beijing, China
- Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases, Beijing, China
| | - Dongsheng Fan
- Department of Neurology, Peking University Third Hospital, Beijing, China
- Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases, Beijing, China
- Key Laboratory for Neuroscience, National Health Commission/Ministry of Education, Peking University, Beijing, China
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Babcock CD, Volk VL, Zeng W, Hamilton LD, Shelburne KB, Fitzpatrick CK. Neural-driven activation of 3D muscle within a finite element framework: exploring applications in healthy and neurodegenerative simulations. Comput Methods Biomech Biomed Engin 2023:1-11. [PMID: 37966863 PMCID: PMC11093887 DOI: 10.1080/10255842.2023.2280772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 11/02/2023] [Indexed: 11/16/2023]
Abstract
This paper presents a novel computational framework for neural-driven finite element muscle models, with an application to amyotrophic lateral sclerosis (ALS). The multiscale neuromusculoskeletal (NMS) model incorporates physiologically accurate motor neurons, 3D muscle geometry, and muscle fiber recruitment. It successfully predicts healthy muscle force and tendon elongation and demonstrates a progressive decline in muscle force due to ALS, dropping from 203 N (healthy) to 155 N (120 days after ALS onset). This approach represents a preliminary step towards developing integrated neural and musculoskeletal simulations to enhance our understanding of neurodegenerative and neurodevelopmental conditions through predictive NMS models.
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Affiliation(s)
- Colton D. Babcock
- Mechanical and Biomedical Engineering, Boise State University, Boise, ID
| | - Victoria L. Volk
- Mechanical and Biomedical Engineering, Boise State University, Boise, ID
| | - Wei Zeng
- Department of Mechanical Engineering, New York Institute of Technology, New York, NY
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Gupta AS, Patel S, Premasiri A, Vieira F. At-home wearables and machine learning sensitively capture disease progression in amyotrophic lateral sclerosis. Nat Commun 2023; 14:5080. [PMID: 37604821 PMCID: PMC10442344 DOI: 10.1038/s41467-023-40917-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 08/04/2023] [Indexed: 08/23/2023] Open
Abstract
Amyotrophic lateral sclerosis causes degeneration of motor neurons, resulting in progressive muscle weakness and impairment in motor function. Promising drug development efforts have accelerated in amyotrophic lateral sclerosis, but are constrained by a lack of objective, sensitive, and accessible outcome measures. Here we investigate the use of wearable sensors, worn on four limbs at home during natural behavior, to quantify motor function and disease progression in 376 individuals with amyotrophic lateral sclerosis. We use an analysis approach that automatically detects and characterizes submovements from passively collected accelerometer data and produces a machine-learned severity score for each limb that is independent of clinical ratings. We show that this approach produces scores that progress faster than the gold standard Amyotrophic Lateral Sclerosis Functional Rating Scale-Revised (-0.86 ± 0.70 SD/year versus -0.73 ± 0.74 SD/year), resulting in smaller clinical trial sample size estimates (N = 76 versus N = 121). This method offers an ecologically valid and scalable measure for potential use in amyotrophic lateral sclerosis trials and clinical care.
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Affiliation(s)
- Anoopum S Gupta
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
| | - Siddharth Patel
- Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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Transplantation of human neural progenitor cells secreting GDNF into the spinal cord of patients with ALS: a phase 1/2a trial. Nat Med 2022; 28:1813-1822. [PMID: 36064599 PMCID: PMC9499868 DOI: 10.1038/s41591-022-01956-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 07/18/2022] [Indexed: 11/08/2022]
Abstract
Amyotrophic lateral sclerosis (ALS) involves progressive motor neuron loss, leading to paralysis and death typically within 3–5 years of diagnosis. Dysfunctional astrocytes may contribute to disease and glial cell line-derived neurotrophic factor (GDNF) can be protective. Here we show that human neural progenitor cells transduced with GDNF (CNS10-NPC-GDNF) differentiated to astrocytes protected spinal motor neurons and were safe in animal models. CNS10-NPC-GDNF were transplanted unilaterally into the lumbar spinal cord of 18 ALS participants in a phase 1/2a study (NCT02943850). The primary endpoint of safety at 1 year was met, with no negative effect of the transplant on motor function in the treated leg compared with the untreated leg. Tissue analysis of 13 participants who died of disease progression showed graft survival and GDNF production. Benign neuromas near delivery sites were common incidental findings at post-mortem. This study shows that one administration of engineered neural progenitors can provide new support cells and GDNF delivery to the ALS patient spinal cord for up to 42 months post-transplantation. A phase 1/2a study shows that human neural progenitor cells modified to release the growth factor GDNF are safely transplanted into the spinal cord of patients with ALS, with cell survival and GDNF production for over 3 years.
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Helleman J, Johnson B, Holdom C, Hobson E, Murray D, Steyn FJ, Ngo ST, Henders A, Lokeshappa MB, Visser-Meily JMA, van den Berg LH, Hardiman O, Beelen A, McDermott C, van Eijk RPA. Patient perspectives on digital healthcare technology in care and clinical trials for motor neuron disease: an international survey. J Neurol 2022; 269:6003-6013. [PMID: 35849154 PMCID: PMC9294855 DOI: 10.1007/s00415-022-11273-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 11/30/2022]
Abstract
Introduction To capture the patient’s attitude toward remote monitoring of motor neuron disease (MND) in care and clinical trials, and their concerns and preferences regarding the use of digital technology. Methods We performed an international multi-centre survey study in three MND clinics in The Netherlands, the United Kingdom, and Australia. The survey was co-developed by investigators and patients with MND, and sent to patients by e-mail or postal-mail. The main topics included: patients’ attitude towards remote care, participating in decentralized clinical trials, and preferences for and concerns with digital technology use. Results In total, 332 patients with MND participated. A majority of patients indicated they would be happy to self-monitor their health from home (69%), be remotely monitored by a multidisciplinary care team (75%), and would be willing to participate in clinical trials from home (65%). Patients considered respiratory function and muscle strength most valuable for home-monitoring. The majority of patients considered the use of at least three devices/apps (75%) once a week (61%) to be acceptable for home-monitoring. Fifteen percent of patients indicated they would not wish to perform home-measurements; reporting concerns about the burden and distress of home-monitoring, privacy and data security. Conclusion Most patients with MND exhibited a positive attitude toward the use of digital technology in both care and clinical trial settings. A subgroup of patients reported concerns with home-monitoring, which should be addressed in order to improve widespread adoption of remote digital technology in clinical MND care. Supplementary Information The online version contains supplementary material available at 10.1007/s00415-022-11273-x.
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Affiliation(s)
- Jochem Helleman
- Department of Rehabilitation, Physical Therapy Science and Sports, UMC Utrecht Brain Center, University Medical Center Utrecht, Utrecht, the Netherlands.,Center of Excellence for Rehabilitation Medicine, UMC Utrecht Brain Center, University Medical Center Utrecht, and De Hoogstraat Rehabilitation, Utrecht, the Netherlands
| | - Barbara Johnson
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, Sheffield, UK
| | - Cory Holdom
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia.,UQ Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Esther Hobson
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, Sheffield, UK
| | - Deirdre Murray
- Academic Unit of Neurology, Trinity College Dublin, Dublin, Ireland.,Physiotherapy Department, Beaumont Hospital, Dublin, Ireland
| | - Frederik J Steyn
- School of Biomedical Sciences, Faculty of Medicine, University of Queensland, Brisbane, Australia.,The Royal Brisbane and Women's Hospital, Herston, Australia.,Wesley Medical Research, The Wesley Hospital, Auchenflower, Australia.,Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Shyuan T Ngo
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia.,The Royal Brisbane and Women's Hospital, Herston, Australia.,Centre for Clinical Research, The University of Queensland, Brisbane, Australia
| | - Anjali Henders
- Institute for Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Madhura B Lokeshappa
- Institute for Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Johanna M A Visser-Meily
- Department of Rehabilitation, Physical Therapy Science and Sports, UMC Utrecht Brain Center, University Medical Center Utrecht, Utrecht, the Netherlands.,Center of Excellence for Rehabilitation Medicine, UMC Utrecht Brain Center, University Medical Center Utrecht, and De Hoogstraat Rehabilitation, Utrecht, the Netherlands
| | - Leonard H van den Berg
- Department of Neurology, UMC Utrecht Brain Centre, University Medical Centre Utrecht, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands
| | - Orla Hardiman
- Department of Neurology, National Neuroscience Centre, Beaumont Hospital, Dublin, Ireland.,FutureNeuro SFI Research Centre, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Anita Beelen
- Department of Rehabilitation, Physical Therapy Science and Sports, UMC Utrecht Brain Center, University Medical Center Utrecht, Utrecht, the Netherlands.,Center of Excellence for Rehabilitation Medicine, UMC Utrecht Brain Center, University Medical Center Utrecht, and De Hoogstraat Rehabilitation, Utrecht, the Netherlands
| | - Chris McDermott
- Department of Neuroscience, Sheffield Institute for Translational Neuroscience, University of Sheffield, Sheffield, UK
| | - Ruben P A van Eijk
- Department of Neurology, UMC Utrecht Brain Centre, University Medical Centre Utrecht, Heidelberglaan 100, 3584 CX, Utrecht, the Netherlands. .,Biostatistics and Research Support, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands.
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Thakore NJ, Drawert BJ, Lapin BR, Pioro EP. Progressive arm muscle weakness in ALS follows the same sequence regardless of onset site: use of TOMS, a novel analytic method to track limb strength. Amyotroph Lateral Scler Frontotemporal Degener 2021; 22:380-387. [PMID: 33620270 PMCID: PMC8292176 DOI: 10.1080/21678421.2021.1889000] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/29/2020] [Accepted: 02/07/2021] [Indexed: 10/22/2022]
Abstract
Objective: Examine sequence of weakness in arm muscles from longitudinal hand-held dynamometry (HHD) data in ALS for congruence with contiguous spread of neurodegeneration along spinal cord segments. Methods: Longitudinal HHD data from the Ceftriaxone clinical trial were examined using nonlinear mixed models, assuming a logistic trajectory from normal to zero strength. Unobserved baseline normal strength of weak muscles was assumed using strength of the best-preserved muscle. A novel metric called "time from onset to midway strength" (TOMS) was estimated for each muscle group, and TOMS ratios were examined to identify sequence of weakness, overall and by onset site. Results: Shoulder flexion (SF), elbow flexion (EF), elbow extension (EE), wrist extension (WE), and first dorsal interosseous (FDI) were measured on each side. Over a median of 36 weeks, 513 subjects provided 2589 sets of HHD measures. TOMS increased sequentially in the following order: FDI, WE, SF, EF, and EE. TOMS ratios estimates with 95% CIs (adjusted for multiple comparisons) were: WE/FDI 1.32 (1.24-1.41), SF/WE 1.06 (1.01-1.10), EF/SF 1.06 (1.02-1.10), and EE/EF 1.18 (1.12-1.23). Elbow and shoulder flexors weakened sooner than did elbow extensors. The sequence of arm muscle weakness progression was similar regardless of onset site. Conclusion: Nonsegmental progression of arm muscle weakness that is similar for different onset sites favors cortical influence/network spread over contiguous spread of neurodegeneration in the spinal cord. Furthermore, this study confirms the "split elbow" pattern. TOMS and other proposed methods may have value as outcome measures in clinical research.
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Affiliation(s)
- Nimish J. Thakore
- Department of Neurology, Neuromuscular Center, Cleveland Clinic, Cleveland, OH, USA
| | - Brian J. Drawert
- Department of Computer Science, University of North Carolina at Asheville, Asheville, NC, USA
| | - Brittany R. Lapin
- Quantitative Health Sciences/Neurological Institute Center for Outcomes Research and Evaluation (NICORE), Cleveland Clinic, Cleveland, OH, USA
| | - Erik P. Pioro
- Department of Neurology, Neuromuscular Center, Cleveland Clinic, Cleveland, OH, USA
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, OH, USA
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Portable fixed dynamometry: towards remote muscle strength measurements in patients with motor neuron disease. J Neurol 2020; 268:1738-1746. [PMID: 33355879 PMCID: PMC8068646 DOI: 10.1007/s00415-020-10366-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 12/08/2020] [Accepted: 12/09/2020] [Indexed: 12/11/2022]
Abstract
Background We aimed to determine (1) the test–retest reliability of a newly developed portable fixed dynamometer (PFD) as compared to the hand-held dynamometer (HHD) in patients with motor neuron disease (MND) and (2) the PFD’s ability to reduce possible examiner-induced ceiling effects. Methods Test–retest reliability of isometric muscle strength of the quadriceps was measured in patients with MND and non-neurological controls using the HHD and PFD. Reliability was estimated by the intraclass correlation coefficient (ICC) and standard error of measurement (SEM) using linear mixed effects models, and the Bland–Altman method of agreement. Results In total, 45 patients with MND and 43 healthy controls were enrolled in this study. The ICC of the PFD was excellent and similar in both patients and controls (ICC Patients 99.5% vs. ICC Controls 98.6%) with a SEM of 6.2%. A strong examiner-induced ceiling effect in HHD was found when the participant’s strength exceeded that of examiner. Employing the PFD increased the range of muscle strength measurements across individuals nearly twofold from 414 to 783 N. Conclusions Portable fixed dynamometry may significantly reduce examiner-induced ceiling effects, optimize the standardization of muscle strength testing, and maximize reliability. Ultimately, PFD may improve the delivery of care due to its potential for unsupervised, home-based assessments and reduce the burden to the patient of participating in clinical trials for MND or other neuromuscular diseases.
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Geijo-Barrientos E, Pastore-Olmedo C, De Mingo P, Blanquer M, Gómez Espuch J, Iniesta F, Iniesta NG, García-Hernández A, Martín-Estefanía C, Barrios L, Moraleda JM, Martínez S. Intramuscular Injection of Bone Marrow Stem Cells in Amyotrophic Lateral Sclerosis Patients: A Randomized Clinical Trial. Front Neurosci 2020; 14:195. [PMID: 32265627 PMCID: PMC7105864 DOI: 10.3389/fnins.2020.00195] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 02/24/2020] [Indexed: 12/11/2022] Open
Abstract
Background Preclinical studies suggest that stem cells may be a valuable therapeutic tool in amyotrophic lateral sclerosis (ALS). As it has been demonstrated that there are molecular changes at the end-plate during the early stages of motorneuron degeneration in animal models, we hypothesize that the local effect of this stem cell delivery method could slow the progressive loss of motor units (MUs) in ALS patients. Methods We designed a Phase I/II clinical trial to study the safety of intramuscularly implanting autologous bone marrow mononuclear cells (BMMCs), including stem cells, in ALS patients and their possible effects on the MU of the tibialis anterior (TA) muscle. Twenty-two patients participated in a randomized, double-blind, placebo-controlled trial that consisted of a baseline visit followed by one intramuscular injection of BMNCs, follow-up visits at 30, 90, 180, and 360 days, and an additional year of clinical follow-up. In each patient, one TA muscle was injected with a single dose of BMMCs while the contralateral muscle was given a placebo; the sides were selected randomly. All visits included a complete EMG study of both TA muscles. Results Our results show that (1) the intramuscular injection of BMMCs is a safe procedure; (2) ALS patients show heterogeneities in the degree of TA injury; (3) a comparison of placebo-injected muscles with BMMC-injected muscles showed significant differences in only one parameter, the D50 index used to quantify the Compound Muscle Action Potential (CMAP) scan curve. This parameter was higher in the BMMC-injected TA muscle at both 90 days (placebo side: 29.55 ± 2.89, n = 20; experimental side: 39.25 ± 3.21, n = 20; p < 0.01) and 180 days (placebo side: 29.35 ± 3.29, n = 17; experimental side: 41.24 ± 3.34, n = 17; p < 0.01). Conclusion This procedure had no effect on the TA muscle MU properties, with the exception of the D50 index. Finding differences in just this index supports the fact that it may be much more sensitive than other electrophysiological parameters when studying treatment effects. Given the low number of patients and their heterogeneity, these results justify exploring the efficacy of this procedure in further patients and other muscles, through Phase II trials. Clinical Trial Registration www.clinicaltrials.gov (identifier NCT02286011); EudraCT number 2011-004801-25.
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Affiliation(s)
| | - Carlos Pastore-Olmedo
- Institute of Neurosciences, Universidad Miguel Hernández-CSIC, Alicante, Spain.,Clinical Neurophysiology Service, San Juan University Hospital, Alicante, Spain
| | - Pedro De Mingo
- Service of Clinical Neurophysiology, Virgen de la Arrixaca University Clinical Hospital, Murcia, Spain
| | - Miguel Blanquer
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
| | - Joaquín Gómez Espuch
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain
| | - Francisca Iniesta
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
| | - Natalia García Iniesta
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
| | - Ana García-Hernández
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
| | | | - Laura Barrios
- Department of Applied Statistics, SGAI-CSIC, Madrid, Spain
| | - José M Moraleda
- Hematopoietic Stem Cell Transplant and Cell Therapy Unit, Hematology Service, Virgen de la Arrixaca University Hospital, University of Murcia, Murcia, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
| | - Salvador Martínez
- Institute of Neurosciences, Universidad Miguel Hernández-CSIC, Alicante, Spain.,Institute for Bio-Health Research of Murcia (IMIB-Arrixaca), Murcia, Spain
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Differential involvement of forearm muscles in ALS does not relate to sonographic structural nerve alterations. Clin Neurophysiol 2018; 129:1438-1443. [DOI: 10.1016/j.clinph.2018.04.610] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 03/16/2018] [Accepted: 04/08/2018] [Indexed: 02/06/2023]
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