1. Department of Paediatric Neurology; Evelina's Children Hospital; Guy's & St. Thomas' Hospital NHS Foundation Trust; London UK
2. Department of Neurophysiology; Great Ormond Street Hospital for Children; London UK
3. Department of Genetics; University of Groningen; University Medical Center Groningen; The Netherlands
4. Department of Clinical Genetics; Guy's Hospital; London UK
5. Randall Division for Cell and Molecular Biophysics; Muscle Signalling Section; King's College London UK
6. Department of Basic and Clinical Neuroscience; IoPPN; King's College; London UK