1. Folkhälsan Research Center Helsinki Finland
2. MedicumUniversity of Helsinki Helsinki Finland
3. Neuromuscular Research CenterTampere University Hospital and Tampere University Tampere Finland
4. Department of NeurologyDonostia University Hospital San Sebastián Spain
5. Department of NeurologyKarolinska University Hospital Stockholm Sweden
6. Department of Pathology, Neuropathology and Neuromuscular UnitBiomedical Research Institute of Bellvitge, Bellvitge University Hospital Hospitalet de Llobregat Spain
7. Neuromuscular Diseases Center of CompetenceMarin Hospital, Public Hospital Network of Paris Hendaye France
8. Department of NeurologyVaasa Central Hospital Vaasa Finland