1. The Dubowitz Neuromuscular Centre, UCL Great Ormond Street Institute of Child Health, 30 Guildford Street, London, WC1N 1EH, United Kingdom
2. National Institute for Health Research, Great Ormond Street Institute of Child Health Biomedical Research Centre, University College London, London WC1N 1EH, United Kingdom
3. John Walton Muscular Dystrophy Research Centre, MRC Centre for Neuromuscular Diseases, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
4. Institute I-Motion, Hôpital Armand Trousseau, Paris, France
5. Centre de Référence des maladies Neuromusculaires, CHU de Liège, Liège, Belgium
6. Department of Rehabilitation, Amalia Children's Hospital, Radboud university medical centre, Nijmegen, Netherlands
7. Department of Neurology, Leiden University Medical Center, RC Leiden, Netherlands
8. Duchenne Center Netherlands
9. Northern Genetics Service, Newcastle upon Tyne Hospitals NHS Foundation Trust, Institute of Human Genetics, International Centre for Life, Central Parkway, Newcastle upon Tyne, United Kingdom