1. University of Amsterdam; Department of Neurology, Academic Medical Centre; PO Box 22660 Amsterdam Netherlands 1100 DD
2. University of Amsterdam; Department of Neurosurgery, Academic Medical Centre; PO Box 22660 Amsterdam Netherlands 1100 DD
3. University Medical Center Utrecht; Department of Neurology and Neurosurgery; PO Box 85500 Utrecht Netherlands 3508 GA
4. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care/University Department of Neurology and Neurosurgery; PO Box 85500 Utrecht Netherlands 3508 GA
5. University Medical Center Utrecht; Department of Neurology; PO Box 85500 Utrecht Netherlands 3508 GA