1. Folkhälsan Research Center Helsinki Finland
2. Department of Medical and Clinical Genetics, Medicum University of Helsinki Helsinki Finland
3. Department of Neurology, Eginition Hospital, Medical School National and Kapodistrian University of Athens Athens Greece
4. Department of Radiology IASO Children's Hospital Athens Greece
5. Neuromuscular Research Center, Department of Neurology Tampere University and University Hospital Tampere Finland
6. Department of Neurology Vaasa Central Hospital Vaasa Finland