1. Department of Radiation Oncology; Medical Center, Medical Faculty; University of Freiburg; Freiburg im Breisgau Germany
2. Department of Oncology and Palliative Medicine; Nordland Hospital; Bodø Norway
3. Institute of Clinical Medicine, Faculty of Health Sciences; University of Tromsø; Tromsø Norway
4. Deutsches Konsortium für Translationale Krebsforschung (DKTK), Partner Site Freiburg; Freiburg im Breisgau Germany
5. Department of Radiation Oncology, Klinikumrechts der Isar; Technical University of Munich; Munich Germany
6. Institute of Innovative Radiotherapy (iRT); Helmholtz Zentrum Munich; Oberschleißheim Germany
7. Deutsches Konsortium für Translationale Krebsforschung (DKTK), Partner Site Munich; Munich Germany