1. Department of Human Genetics, Leiden University Medical Centre, Leiden
2. Department Neurology, St. Elisabeth and Tweesteden Hospital, Tilburg
3. Department Pharmacology and Toxicology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen
4. Department Neurology, Leiden University Medical Centre Leiden, Leiden
5. Department Neurology, Rijnland Hospital, Leiderdorp
6. Department Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands