1. Department of Radiation Oncology, Technical University of Munich (TUM), Klinikum rechts der Isar, 81675 München, Germany
2. Institute of Radiation Medicine (IRM), Helmholtz Zentrum München, 85764 Neuherberg, Germany
3. Deutsches Konsortium für Translationale Krebsforschung (DKTK), Partner Site Munich, 80336 München, Germany
4. Department of Radiation Oncology, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
5. Department of Radiation Oncology, University Medical Center, Medical Faculty, 79106 Freiburg, Germany
6. Department of Neurosurgery, Faculty of Medicine, Technical University of Munich, 81675 München, Germany
7. Department of Radiation Oncology, University Medical Center Augsburg, 86156 Augsburg, Germany
8. Department of Neurosurgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, 10117 Berlin, Germany
9. Berlin Institute of Health, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany
10. German Cancer Consortium (DKTK), Partner Site Berlin, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
11. Department of Radiotherapy and Radiation Oncology, University Medical Center Göttingen, 37075 Göttingen, Germany
12. Comprehensive Cancer Center Niedersachsen (CCC-N), 37075 Göttingen, Germany
13. Department of Radiation Oncology, University Hospital Bonn, University of Bonn, 53127 Bonn, Germany
14. Department of Neurosurgery, University Medical Center Augsburg, 86156 Augsburg, Germany
15. Department of Neurosurgery, University Hospital Freiburg, 79106 Freiburg, Germany
16. Department of Neurosurgery, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
17. Neurosurgical Clinic, Klinikum Stuttgart, 70174 Stuttgart, Germany
18. Department of Neurosurgery, University Hospital Bonn, 53127 Bonn, Germany
19. Department of Radiation Oncology, Klinikum Stuttgart Katharinenhospital, 70174 Stuttgart, Germany
20. Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland
21. Department of Neurosurgery, Universitätsmedizin Göttingen, 37075 Göttingen, Germany
22. Department of Neurosurgery, University of Geneva Medical Center & Faculty of Medicine, 1211 Geneva, Switzerland
23. Mannheim Cancer Center, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
24. Department of Neurosurgery, Medical University of Innsbruck, 6020 Innsbruck, Austria