1. Department of Neurology; University Hospital Zurich; Zurich Switzerland
2. Zurich and Zug Cancer Registry; University Hospital Zurich; Zurich Switzerland
3. Department of Neuropathology; University Hospital Zurich; Zurich Switzerland
4. Department of Radiation Oncology; University Hospital Zurich; Zurich Switzerland
5. Department of Oncology; University Hospital Zurich; Zurich Switzerland
6. Department of Neurosurgery; University Hospital Zurich; Zurich Switzerland
7. Department of Neuroradiology; University Hospital Zurich; Zurich Switzerland
8. Chronic Disease Epidemiology, Epidemiology, Biostatistics and Prevention Institute; University of Zurich; Zurich Switzerland
9. Department of Oncology; Kantonsspital Winterthur; Winterthur Switzerland
10. Department of Neurosurgery; Kantonsspital Winterthur; Winterthur Switzerland
11. International Agency for Research on Cancer; Lyon France