1. Research Programs Unit, Stem Cells and Metabolism, Faculty of Medicine University of Helsinki Helsinki Finland
2. Clinical Neurosciences, Neurology University of Helsinki and Helsinki University Hospital Helsinki Finland
3. Department of Pediatrics, The Queen Silvia Children's Hospital University of Gothenburg Gothenburg Sweden
4. Department of Clinical Medicine (K1) University of Bergen Bergen Norway
5. Department of Neurology Haukeland University Hospital Bergen Norway
6. Department of Pediatrics Haukeland University Hospital Bergen Norway
7. Department of Pediatric Neurology, Clinic for Children and Adolescents, Medical Research Center Oulu University Hospital, and PEDEGO Research Unit, University of Oulu Oulu Finland
8. Child Neurology, Children's Hospital, Pediatric Research Center University of Helsinki and Helsinki University Hospital Helsinki Finland
9. Department of Neurology Medical Spectrum Twente Enschede The Netherlands
10. Department of Genetics and Cell Biology University of Maastricht Maastricht The Netherlands
11. Neuroscience Center, HiLife University of Helsinki Helsinki Finland