1. Department of Neurology, Radboud University Medical Center, Nijmegen, The Netherlands
2. Department of Neurology, Gelre Hospital Zutphen, Zutphen, The Netherlands
3. Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
4. Department of Pathology, Antwerp University Hospital, University of Antwerp, Antwerp, Belgium
5. Department of Pathology, Radboud University Medical Centre, Nijmegen, The Netherlands
6. Department of Laboratory Medicine and Pediatrics, Translational Metabolic Laboratory, Radboud University Medical Centre, The Netherlands