1. Department of Child Neurology, Free University Hospital, Amsterdam, The Netherlands,
2. Laboratory of Pediatrics and Neurology, University Hospital Sint Radboud, Nijmegen, The Netherlands
3. Department of Medical Genetics, Tohoku University School of Medicine Sendai, Japan
4. Interdisciplinary Center for Child Neurology University Hospital Sint Radboud, Nijmegen, The Netherlands
5. Department of Clinical Chemistry, Metabolic Unit Free University Hospital, Amsterdam, The Netherlands
6. Center for Metabolic Disease, University Hospital Gasthuisberg Leuven, Belgium