1. Department of Pediatric Neurology Radboud University Medical Center, Amalia Children's Hospital, Donders Institute for Brain Cognition and Behaviour Nijmegen The Netherlands
2. Department of Neurology, Donders Institute for Brain Cognition and Behaviour Radboud University Medical Center Nijmegen The Netherlands
3. Department of Neurology Zuyderland Medical Center Sittard The Netherlands
4. Department of Dermatology, The GROW School for Oncology and Developmental Biology Maastricht University Medical Center Maastricht The Netherlands
5. Laboratory Genetic Metabolic Diseases, Amsterdam Gastroenterology & Metabolism Amsterdam UMC, University of Amsterdam Amsterdam The Netherlands
6. Department of Neurology Franciscus Gasthuis and Vlietland Rotterdam The Netherlands
7. Department of Dermatology Radboud University Medical Center Nijmegen The Netherlands
8. Department of Ophthalmology, Donders Institute for Brain Cognition and Behaviour Radboud University Medical Center Nijmegen The Netherlands