1. Department of Neurology, Donders Institute for Brain, Cognition and Behaviour Radboud University Medical Center Nijmegen The Netherlands
2. Department of Neurology University of Texas Southwestern Medical Center Dallas Texas USA
3. Neuromuscular Center Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Dallas Texas USA
4. Neurology Department Raymond‐Poincaré Hospital Garches France
5. Copenhagen Neuromuscular Center, Rigshospitalet University of Copenhagen Copenhagen Denmark