1. Department of Neurology, Section for Rare Neuromuscular disorders and EMAN Oslo University Hospital, Rikshospitalet Oslo Norway
2. National Neuromuscular Centre Norway and Department of Neurology University Hospital of North Norway Tromsø Norway
3. Department of Cardiology Oslo University Hospital, Rikshospitalet Oslo Norway
4. Department of Microbiology Oslo University Hospital, Rikshospitalet and University of Oslo Oslo Norway
5. Department of Medical Biochemistry Institute for Clinical Medicine, University of Oslo Oslo Norway
6. Norwegian National Unit for Newborn Screening, Division of Pediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
7. Department of Clinical Neurosciences for Children Oslo University Hospital, Rikshospitalet Oslo Norway
8. Department of Medical Biochemistry Oslo University Hospital, Rikshospitalet Oslo Norway
9. Department of Medical Genetics, Division of Child and Adolescent Health University Hospital of North Norway Tromsø Norway