1. Neuromuscular Research Center; Tampere University and University Hospital; Tampere
2. Division of Clinical Neurosciences; Turku University Hospital and University of Turku; Turku
3. Department of Neurology; Central Hospital of Northern Karelia; Joensuu
4. Folkhälsan Institute of Genetics and Department of Medical Genetics; Haartman Institute; University of Helsinki; Helsinki
5. Department of Neurology; Vasa Central Hospital; Vasa Finland