1. Department of Neurosurgery, University Medical Center St. Radboud, Nijmegen, The Netherlands
2. Department of Neurology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands
3. University Medical Center, Faculty of Medicine, Medical and Technology Assessment, Nijmegen, The Netherlands
4. Department of Clinical Neurophysiology, Canisius Wilhelmina Hospital, Nijmegen, The Netherlands