1. Neuro-oncology Research Group, VU University Medical Center, Cancer Center Amsterdam, Amsterdam, The Netherlands;
2. Department of Neurosurgery, VU University Medical Center, Cancer Center Amsterdam, Amsterdam, The Netherlands;
3. Department of Radiation Sciences, Oncology, Umeå University, Umeå, Sweden;
4. Molecular Neurogenetics Unit, Department of Neurology, Massachusetts General Hospital and Harvard Medical School, Boston, MA; and
5. Departments of Pediatric Oncology,
6. Pathology, and
7. Medical Oncology, VU University Medical Center, Cancer Center Amsterdam, Amsterdam, The Netherlands