1. Department of Neurology; Seinäjoki Central Hospital; Seinäjoki Finland
2. Neuromuscular Research Center; Department of Neurology; University Hospital and University of Tampere, Tampere; Finland
3. Department of Neurology; Pietarsaari District Hospital; Pietarsaari Finland
4. Department of Neurology; University of Oulu; Oulu Finland
5. Don Carlo Gnocchi Onlus Foundation, Rome; Italy
6. Institute of Neurology; Catholic University School of Medicine; Rome Italy
7. Department of Medical Genetics; Folkhälsan Institute of Genetics; University of Helsinki; Helsinki Finland
8. Vaasa Central Hospital; Vaasa Finland