1. Copenhagen Neuromuscular Center, Rigshospitalet, University of Copenhagen Copenhagen Denmark
2. Neurology and Neuromuscular Disorders Unit, Department of Clinical and Experimental Medicine University of Messina Messina Italy
3. Enzyme Laboratory, Department of Chemical Pathology Cameilia Botnar Laboratories, Great Ormond Street Hospital for Sick Children London UK
4. Department of Clinical Neurology West Wing, John Radcliffe Hospital Oxford UK
5. Dubowitz Neuromuscular Centre, Great Ormond Street Hospital for Children NHS Foundation Trust London UK