1. Department of Radiology, Medical Imaging Center, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
2. Department of Neurology, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
3. Department of Radiology, Hospital Group Twente, 7600 SZ Almelo, The Netherlands
4. Department of Neurosurgery, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands
5. Department of Nuclear Medicine, Medical Imaging Center, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands