1. Department of Paediatrics and Adolescent Medicine Haukeland University Hospital Bergen5021Norway
2. Department of Clinical Medicine (K1) University of Bergen Bergen Norway
3. Centre for Inherited Metabolic Diseases Karolinska University Hospital Stockholm Sweden
4. Department of Medical Biochemistry and Biophysics Karolinska Institute Stockholm Sweden
5. Department of Molecular Medicine and Surgery Karolinska Institute Stockholm Sweden
6. Department of Paediatric and Adolescent Medicine University Hospital of North Norway Tromso Norway
7. Paediatric Research Group Department of Clinical Medicine UiT‐ The Arctic University of Norway Tromso Norway
8. Women and Children's Division Department of Clinical Neurosciences for Children Oslo University Hospital Oslo Norway
9. Unit for Congenital and Hereditary Neuromuscular Disorders Department of Neurology Oslo University Hospital Oslo Norway
10. Department of Neurology Oslo University Hospital Oslo Norway
11. Institute of Clinical Medicine Faculty of Medicine University of Oslo Oslo Norway
12. Department of Neuroscience Norwegian University of Science and Technology Trondheim Norway
13. Department of Neurology and Clinical Neurophysiology St. Olav's University Hospital Trondheim Norway
14. Department of Clinical Genetics Copenhagen University Hospital Rigshospitalet Copenhagen Denmark
15. Department of Neurology Medical Spectrum Twente Enschede The Netherlands
16. Department of Genetics and Cell Biology University of Maastricht Maastricht The Netherlands
17. Department of Neurology Sant Joan de Déu Children´s Hospital Barcelona Spain
18. Department of Pediatric Neurology Children's HospitalHelsinki University Hospital Helsinki Finland
19. Stem Cells and Metabolism Research Program Faculty of Medicine University of Helsinki Helsinki Finland
20. PEDEGO Research Unit University of Oulu Oulu Finland
21. Department of Pediatric Neurology Clinic for Children and Adolescents Medical Research Center Oulu University Hospital Oulu Finland
22. Department of Pediatrics The Queen Silvia Children's HospitalUniversity of Gothenburg Gothenburg Sweden
23. Mitochondrial Research Group UCL Great Ormond Street Institute of Child Health London United Kingdom
24. Metabolic Unit Great Ormond Street Hospital for Children NHS Foundation Trust London United Kingdom
25. Department of Neurology Haukeland University Hospital Bergen5021Norway