1. University of Groningen, University Medical Centre GroningenDepartment of Neurology Groningen the Netherlands
2. Ommelander Ziekenhuis GroningenDepartment of Neurology Scheemda the Netherlands
3. Department of NeurologyLeiden University Medical Centre Leiden the Netherlands
4. Department of NeurologyHaga Teaching Hospital The Hague the Netherlands
5. Medisch Spectrum TwenteDepartment of Neurology Enschede the Netherlands
6. Neuroscience and Mental Health Research Institute, Division of Psychological Medicine and Clinical NeuroscienceCardiff University Cardiff United Kingdom
7. Movement Disorders Unit, Department of Neurology, Westmead Hospital & Sydney Medical SchoolUniversity of Sydney Sydney Australia
8. Département de Neurologie, AP‐HP, Hôpital Pitié‐Salpêtrière and Sorbonne UniversitésUniversité Pierre and Marie Curie, Institut du Cerveau et de la Moelle épinière Paris France
9. University of Groningen, University Medical Centre GroningenDepartment of Health Sciences, Community and Occupational Medicine Groningen the Netherlands
10. Radboud University Medical CentreAmalia Children's Hospital, Department of Pediatric Neurology Nijmegen the Netherlands
11. Department of Child Neurology, Emma Children's Hospital, Amsterdam University Medical CentersVrije Universiteit Amsterdam and Amsterdam Neuroscience Amsterdam the Netherlands
12. University of Groningen, University Medical Centre GroningenDepartment of Genetics Groningen the Netherlands
13. University of Groningen, University Medical Centre GroningenDepartment of Pediatrics Groningen the Netherlands