1. Department of Neurosurgery, Haaglanden Medical Center , The Hague , The Netherlands
2. Department of Neurosurgery, Leiden University Medical Center , Leiden , The Netherlands
3. Department of Medical Oncology, University Medical Center Utrecht , Utrecht , The Netherlands
4. Department of Neurosurgery, Haga Teaching Hospital , The Hague , The Netherlands
5. Department of Neurology and Neurosurgery, UMC Utrecht Brain Center, University Medical Center Utrecht , Utrecht , The Netherlands
6. Department of Neurology, Brain Tumor Center, Erasmus MC Cancer Institute, Erasmus MC University Medical Center , Rotterdam , The Netherlands
7. Department of Radiation Oncology, University Medical Center Utrecht , Utrecht , The Netherlands
8. Hartwig Medical Foundation , Amsterdam , The Netherlands