1. Department of Radiation Oncology, University of Freiburg–Medical Center, Freiburg, Germany
2. German Cancer Consortium (DKTK) Partner Site Freiburg, German Cancer Research Center (DKFZ), Heidelberg, Germany
3. Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
4. DKTK Partner Site Munich, German Cancer Research Center, Heidelberg, Germany
5. Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
6. Comprehensive Cancer Center Erlangen-EMN, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
7. Department of Radiation Oncology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
8. Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center-University of Freiburg, Freiburg, Germany
9. Department of Radiation Oncology, Charité–Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Germany, Berlin, Germany
10. DKTK Partner Site Berlin, DKFZ, Neuenheimer Feld 280, Heidelberg, Germany
11. Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, New York, New York
12. Department of Radiation Oncology, University Hospital Würzburg, Würzburg, Germany
13. Department of Radiotherapy and Oncology, Goethe University Frankfurt, Frankfurt am Main, Germany
14. DKTK Partner Site Frankfurt, German Cancer Research Center, Heidelberg, Germany
15. Department of Radiation Oncology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
16. Department of Radiation Oncology, University Hospitals Seidman Cancer Center, Cleveland, Ohio
17. Department of Radiation Oncology, German Oncology Center, European University of Cyprus, Limassol, Cyprus
18. Department of Radiation Oncology and Radiation Therapy, University Medical Center Mainz, Mainz, Germany
19. DKTK Partner Site Mainz, German Cancer DKFZ, Heidelberg, Germany
20. Department of Radiation Oncology, University of Leipzig, Leipzig, Germany
21. Comprehensive Cancer Center Central Germany, Partner Site Leipzig, Leipzig, Germany