1. Department of Neurology University of Kansas Medical Center Kansas City Kansas USA
2. Department of Pediatrics and Clinical Neurological Sciences University of Western Ontario London Ontario Canada
3. Carolinas MDA Care Center Atrium Health Charlotte North Carolina USA
4. Neuromuscular Division Oregon Health & Science University Portland Oregon USA
5. Neuromuscular Diseases Unit, Neurology Department Hospital de la Santa Creu I Sant Pau Barcelona Spain
6. Instituto de Salud Carlos III Centro de Investigación Biomédica en Red de Enfermedades Raras Madrid Spain
7. John Walton Muscular Dystrophy Research Centre Newcastle University Translational and Clinical Research Institute Newcastle UK
8. Department of Neurology Duke University School of Medicine Durham North Carolina USA
9. University of Calgary Calgary Alberta Canada
10. Montreal Neurological Institute Montreal Quebec Canada
11. University of Rochester School of Medicine Rochester New York USA
12. University of Pennsylvania Philadelphia Pennsylvania USA
13. University of California Davis Medical Center Davis California USA
14. Johns Hopkins School of Medicine Kennedy Krieger Institute Baltimore Maryland USA
15. Department of Neurology University of Minnesota Minneapolis Minnesota USA
16. Brigham and Women's Hospital Boston Massachusetts USA
17. Departments of Neurology and Pediatrics University of Utah Salt Lake City Utah USA
18. University of California Los Angeles Los Angeles California USA
19. University of Colorado Aurora Colorado USA
20. Department of Medicine, GMA Clinic European Reference Network on Rare Neuromuscular Diseases (ERN EURO‐NMD) and Universitat Autònoma de Barcelona Barcelona Spain
21. Indiana University School of Medicine Indianapolis Indiana USA
22. Washington University School of Medicine St. Louis Missouri USA
23. Hospital UIP La Fe Neuromuscular Reference Centre Valencia Spain
24. Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Enfermedades Raras Madrid Spain
25. Virginia Commonwealth University Richmond Virginia USA
26. Carver College of Medicine University of Iowa Iowa City Iowa USA
27. Acceleron Pharma Cambridge Massachusetts USA