1. Department of Neurology; Leiden University Medical Centre; Leiden the Netherlands
2. Department of Clinical Genetics; Maastricht University Medical Centre; Maastricht the Netherlands
3. Centre for Human and Clinical Genetics; Leiden University Medical Centre; Leiden the Netherlands
4. Department of Clinical Genetics; Amsterdam Medical Centre; Amsterdam the Netherlands
5. Department of Clinical Genetics; VU Medical Centre; Amsterdam the Netherlands
6. Department of Medical Genetics; University Medical Centre Utrecht; Utrecht the Netherlands
7. Department of Clinical Genetics; Erasmus Medical Centre; Rotterdam the Netherlands
8. Department of Clinical Genetics; Radboud University Medical Centre; Nijmegen the Netherlands
9. Department of Genetics, University of Groningen; University Medical Centre Groningen; Groningen the Netherlands