1. Department of Neurosurgery, Leiden University Medical Center, Leiden, Netherlands
2. Department of Neurology, Leiden University Medical Center, Leiden, Netherlands
3. Leeds Institute of Cancer and Pathology, St James’s University Hospital, Leeds, United Kingdom
4. Department of Neurology, VU University Medical Center, Amsterdam, Netherlands
5. Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam, Netherlands
6. Department of Neurology, Haaglanden Medical Center, The Hague, Netherlands
7. Department of Neurosurgery, VU University Medical Center, Amsterdam, Netherlands