1. Research Group on Neuromuscular and Mitochondrial Diseases, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain; Paris, France.
2. Biomedical Network Research Centre on Rare Diseases, Instituto de Salud Carlos III, Madrid, Spain; Paris, France.
3. Department of Neurology, H. Houston Merritt Neuromuscular Research Center, Columbia University Medical Center, New York, New York; Paris, France.
4. Genethon and INSERM U951, Evry, France; Paris, France.
5. University Pierre and Marie Curie, Paris, France.