1. Applied Research in Neuromuscular Diseases, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
2. Biomedical Network Research Centre on Rare Diseases (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
3. Neuromuscular Unit, Department of Neurology, Hospital Sant Joan de Déu, Barcelona, Spain
4. Rehabilitation and Physical Unit Department, Hospital Sant Joan de Deu, Barcelona, Spain
5. Department of Neurology, Institut d’InvestigacionsBiomèdiques Sant Pau - Hospital de Sant Pau, Universitat Autònoma de Barcelona, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
6. Department of Genetics, Institut d’Investigacions Biomèdiques Sant Pau - Hospital de Sant Pau, Universitat Autònoma de Barcelona, Barcelona, Spain
7. Statistics Department, Institut de Recerca Sant Joan de Déu, Barcelona, Spain
8. Department of Genetics, Microbiology and Statistics; University of Barcelona