1. Center for Lysosomal and Metabolic Diseases; Erasmus MC University Medical Center; Rotterdam the Netherlands
2. Department of Clinical and Experimental Medicine; University of Messina; Messina Italy
3. Paris-Est; Referral Center for Neuromuscular Disorders; Pitié-Salpêtrière Hospital; Assistance Publique Hôpitaux de Paris; Paris France
4. Fondazione S. Camillo Hospital; IRCCS; Venice Italy
5. Charles Dent Metabolic Unit; National Hospital for Neurology and Neurosurgery; London UK
6. Servicio de Neuropediatria; Hospital Universitario; La Paz Madrid
7. Department of Paediatrics; Universidad Autónoma de Madrid; Madrid Spain
8. Department of Neurology; Salford Royal NHS Foundation Trust; Salford UK
9. Neuromuscular Centre; University Department of Neurology; Inselspital; Bern Switzerland
10. Department of Medicine III; Medical University of Vienna; Vienna Austria
11. Department of Neurology; Erasmus MC University Medical Center; Rotterdam the Netherlands
12. Department of Neurology; Neuromuscular Reference Centre; University Hospitals St-Luc; Brussels Belgium
13. Copenhagen Neuromuscular Center; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
14. Friedrich-Baur-Institute; Ludwig-Maximilians-University; Munich Germany