1. The John Walton Muscular Dystrophy Research Centre Institute of Genetic Medicine Newcastle University Newcastle Hospitals NHS Foundation Trust Central Parkway Newcastle Upon Tyne United Kingdom NE1 4EP
2. Department of Molecular Neurosciences MRC Centre for Neuromuscular Diseases UCL Institute of Neurology London United Kingdom
3. Department of Neurology Copenhagen Neuromuscular Center Rigshospitalet University of Copenhagen Blegdamsvej 9 2100 Copenhagen Denmark
4. Institute of Myology AP6HP, G‐H Pitié‐Salpêtrière 47‐83 boulevard de l'hôpital 75651 Paris Cedex 13 France
5. The Robert Jones and Agnes Hunt Orthopaedic Hospital Oswestry Shropshire United Kingdom
6. Institute of Myology Neuromuscular Investigation Center Pitié‐Salpêtrière Hospital Paris France
7. Newcastle Magnetic Resonance Centre Institute of Cellular Medicine Newcastle University Newcastle upon Tyne United Kingdom