IRCCS Humanitas Research Hospital, University Hospital Zurich, Iridium Netwerk, Netherlands Cancer Institute, affiliation not provided to SSRN, Erasmus University Medical Center Rotterdam - Erasmus MC Cancer Institute, University of Lille II - Centre Oscar Lambret, Department of Radiation Oncology, Amsterdam University Medical Centers, Heidelberg University - University Medical Centre Mannheim, KU Leuven - University Hospitals Leuven, University of Copenhagen - Copenhagen University Hospital, affiliation not provided to SSRN, Medical University of Lodz, affiliation not provided to SSRN, University Hospitals Bristol - University Hospitals Bristol and Weston NHS Foundation Trust, Universidad de Alcalá - Hospital Universitario Ramón y Cajal, affiliation not provided to SSRN, affiliation not provided to SSRN, Scientific Institute for Research, Hospitalization and Healthcare (IRCCS) - Ospedale Sacro Cuore Don Calabria, University of Yamanashi, University of Toronto, University of Toronto - Sunnybrook Research Institute, University of Washington, University of Amsterdam - University Medical Center, University Hospital Zurich - Department of Radiation Oncology and Humanitas University

Department of Radiation Oncology (Maastro), GROW School for Oncology, Maastricht University Medical Centre, Department of Radiation Oncology, Amsterdam University Medical Centers, Department of Radiation Oncology (Maastro), GROW School for Oncology, Maastricht University Medical Centre, Maastricht University, Department of Radiation Oncology, Catharina Hospital, Department of Radiation Oncology, Haaglanden Medical Center, Department of Radiation Oncology, Erasmus MC, Rotterdam, Department of Radiation Oncology, Amsterdam University Medical Centers, Department of Radiation Oncology, Catharina Hospital, Department of Radiation Oncology, Verbeeten Institute Tilburg, Department of Radiation Oncology, Zuid-West Radiotherapy Institute Vlissingen, Department of Radiation Oncology, University Medical Center Utrecht, Department of Radiation Oncology, Amsterdam University Medical Centers, Maastricht University, Maastricht University - GROW School for Oncology and Reproduction and Haaglanden Medical Center

Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Università degli Studi di Palermo, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Mater Olbia Hospital, Department of Radiation Oncology, Amsterdam University Medical Centers, Fondazione Policlinico Universitario A. Gemelli IRCCS - Radiation Oncology Unit, Harvard Medical School - Department of Radiation Oncology, Mater Olbia Hospital and Mater Olbia Hospital