1. CHU Nantes (P-LL, SC, MV, BI, SM), Department of Medical Genetics, France; The Center for Applied Genomics (DL, HH); Division of Human Genetics (DL, HH); Department of Pediatrics (DL, HH, MJF), Perelman School of Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, PA; CHU Nantes (AM, YP), Department of Clinical Neurophysiology; Reference Centre for Neuromuscular Disorders AOC (AM, YP, SM), Filnemus, Euro-NMD, Nantes; CHD Vendée (XM), Service de Pédiatrie, La...