1. Section of Metabolic Diseases, Beatrix Children's Hospital University of Groningen, University Medical Center of Groningen Groningen The Netherlands
2. National Hospital of the Faroe Islands, Medical Center Tórshavn Faroe Islands
3. Neuroimaging Center, Department of Neuroscience University Medical Center Groningen Groningen The Netherlands
4. Center for Human Movement Sciences, University Medical Center Groningen University of Groningen Groningen The Netherlands
5. Department of Neurology, University Medical Centre Groningen University of Groningen Groningen The Netherlands
6. Department of Laboratory Medicine, Laboratory of Metabolic Diseases, University Medical Center Groningen University of Groningen Groningen The Netherlands
7. Department of Physiology, Anatomy and Genetics University of Oxford Oxford UK
8. Center for Child Development and Exercise, Wilhelmina Children's Hospital University Medical Center Utrecht Utrecht The Netherlands