1. ; Department of Metabolic Diseases; University Medical Center; Utrecht The Netherlands
2. ; Department of Pediatric Metabolic Diseases; University Medical Centre Utrecht; PO Box 85090, KC 03.063.0 Utrecht 3508 AB The Netherlands
3. ; Centre de Génétique Humaine; Institut de Pathologie et de Génétique; Loverval Belgium
4. ; Department of Child Neurology; Hospital Saint Joan de Deu; Barcelona Spain
5. ; Department of Child Neurology; University Medical Center Utrecht; The Netherlands
6. ; Laboratory for Genetic Metabolic Diseases; Academic Medical Centre; Amsterdam The Netherlands
7. ; Department of Child Neurology, Emma Children's Hospital; Academic Medical Centre; Amsterdam The Netherlands