1. Department of Radiation Therapy, West German Cancer Center, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
2. Department of Neurology, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
3. Department of Neurosurgery and Spine Surgery, West German Cancer Center, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
4. Institute of Diagnostic and Interventional Radiology and Neuroradiology, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
5. Department of Nuclear Medicine, University Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
6. Institute of Neuropathology, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
7. German Cancer Consortium (DKTK), Partner Site University Hospital Essen, 45147 Essen, Germany
8. DKFZ-Division Translational Neurooncology at the West German Cancer Center (WTZ), DKTK Partner Site, University Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
9. Department of Medical Oncology, West German Cancer Center, University of Duisburg-Essen, University Hospital Essen, 45147 Essen, Germany
10. Department of Radiation Oncology, University of Bonn, University Hospital Bonn, 53127 Bonn, Germany
11. Institute of Experimental Oncology, University of Bonn, University Hospital Bonn, 53127 Bonn, Germany