1. Department of Neurology; Leiden University Medical Center; P.O. Box 9600 2300RC Leiden The Netherlands
2. Department of Clinical Genetics; Leiden University Medical Center; Leiden The Netherlands
3. Department of Medical Genetics; University Medical Center Utrecht; Utrecht The Netherlands
4. Department of Neurology; Radboud University Medical Center; Nijmegen The Netherlands
5. Department of Neurology, Academic Medical Center; University of Amsterdam; Amsterdam The Netherlands
6. Department of Neurology; Erasmus MC University Medical Center; Rotterdam The Netherlands