1. Department of Neurology, Leiden University Medical Center , Leiden , the Netherlands
2. Department of Neurosurgery, Haaglanden Medical Center , The Hague , the Netherlands
3. Department of Neurology, the Brain Tumor Center, Erasmus MC, University Medical Center , Rotterdam , the Netherlands
4. Department of Neurology, Haaglanden Medical Center , The Hague , the Netherlands
5. Department of Neurosurgery, the Brain Tumor Center, Erasmus MC, University Medical Center , Rotterdam , the Netherlands
6. Department of Pathology, the Brain Tumor Center, Erasmus MC, University Medical Center Rotterdam , Rotterdam , the Netherlands
7. Department of Pathology, Leiden University Medical Center , Leiden , the Netherlands
8. Department of Radiology and Nuclear Medicine, the Brain Tumor Center, Erasmus MC, University Medical Center , Rotterdam , the Netherlands