1. Brain Center Rudolf Magnus, Department of Neurology and Neurosurgery, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
2. Department of Neurosurgery, NeuroCenter, Kuopio University Hospital, Kuopio, Finland
3. Department of Neurosurgery, Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland
4. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands
5. Department of Radiology, University Medical Center Utrecht, Utrecht University, Utrecht, the Netherlands