1. Department of Pediatrics, Alrijne Medical Center, Leiderdorp, the Netherlands
2. Laboratory Genetic Metabolic Disease, Academic Medical Center, University of Amsterdam, the Netherlands
3. Department of Clinical Genetics, Leiden University Medical Center, Leiden, the Netherlands
4. Department of Pediatrics, Leiden University Medical Center, Leiden, the Netherlands
5. Department of Pediatrics, Erasmus MC-Sophia Children’s Hospital, Erasmus University Medical Centre, Rotterdam, the Netherlands
6. Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, the Netherlands
7. Department of Pediatrics, Erasmus MC-Sophia Children’s Hospital, Center of Lysosomal and Metabolic disorders, Erasmus University Medical Centre, Rotterdam, the Netherlands
8. Department of Neurology, Leiden University Medical Center, Leiden, the Netherlands