1. Neuromuscular Diseases Unit, Department of Neurology Hospital de la Santa Creu i Sant Pau Barcelona Spain
2. Department of Medicine Universitat Autònoma de Barcelona Barcelona Spain
3. Biomedical Research Institute Sant Pau (IIB Sant Pau) Barcelona Spain
4. Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) Instituto de Salud Carlos III Madrid Spain
5. Neurology Department, Neuromuscular Disorders Unit, Instituto de Biomedicina de Sevilla, Hospital U. Virgen del Rocío, CSIC Universidad de Sevilla Sevilla Spain
6. Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED) Instituto de Salud Carlos III Madrid Spain
7. Neuromuscular Unit, Neurology Department Hospital Universitari i Politècnic La Fe Valencia Spain
8. Department of Medicine Universitat de València Valencia Spain
9. Biomedical Research Institute La Fe (IIS La Fe) Valencia Spain
10. Unitat de Neuromuscular, Neurology Department Hospital Universitari de Bellvitge – IDIBELL L’Hospitalet de Llobregat, Barcelona Spain
11. Neurology Department Hospital Universitario Reina Sofía Córdoba Spain
12. Neurology Department Hospital Clínico Santiago de Compostela Spain
13. Neuromuscular Diseases Unit, Department of Neurology Hospital Germans Trias i Pujol Badalona, Barcelona Spain
14. Service of Neurology University Hospital “Marqués de Valdecilla (IDIVAL)”, University of Cantabria (UC) Santander Spain
15. Neuromuscular Diseases Unit, Department of Neurology Hospital Universitario Infanta Sofía, Universidad Europea de Madrid San Sebastián de los Reyes, Madrid Spain
16. Neurology Department, Donostia University Hospital, University of the Basque Country, Neurosciences Area Biodonostia Research Institute San Sebastián Spain
17. Neuromuscular Diseases Unit, Department of Neurology, Institute of Neurosciences Hospital Universitario Clínico San Carlos Madrid Spain
18. Department of Neurology Complejo Hospitalario de Navarra‐IdisNA Pamplona Spain
19. Department of Neurology Complejo Asistencial Hospitalario de Burgos Burgos Spain
20. Department of Neurology Hospital Universitario de Gran Canaria Doctor Negrín Las Palmas de Gran Canaria Spain
21. Department of Neurology Hospital Central de Asturias Oviedo Spain