1. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Frankfurt Germany
2. Department of Radiotherapy and Oncology; Goethe-University Frankfurt; Germany
3. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Dresden Germany
4. Department of Radiation Oncology; Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden; Germany
5. OncoRay - National Center for Radiation Research in Oncology; Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden; Germany
6. Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiooncology; Germany
7. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Berlin Germany
8. Department of Radiooncology and Radiotherapy; Charité-University Hospital Berlin; Germany
9. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Essen Germany
10. Department of Radiotherapy, Medical Faculty; University of Duisburg-Essen; Essen Germany
11. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Freiburg Germany
12. Department of Radiation Oncology; University of Freiburg; Germany
13. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Heidelberg Germany
14. Department of Radiation Oncology; Heidelberg Ion Therapy Center (HIT), Heidelberg Institute of Radiation Oncology (HIRO), National Center for Radiation Research in Oncology (NCRO), University of Heidelberg Medical School and German Cancer Research Center (DKFZ); Germany
15. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Munich Germany
16. Department of Radiotherapy and Radiation Oncology; Ludwig-Maximilians-University; Munich Germany
17. Department of Radiation Oncology; Technical University Munich; Germany
18. German Cancer Research Center (DKFZ), Heidelberg Germany and German Cancer Consortium (DKTK); Tübingen Germany
19. Department of Radiation Oncology; Faculty of Medicine and University Hospital Tübingen, Eberhard Karls University Tübingen; Germany