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

Medical University of Lublin, Medical University of Lodz, Medical University of Lodz, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universitätsklinikum Leipzig, Medical University of Lodz, University of Milan, University Hospital Magdeburg, affiliation not provided to SSRN, affiliation not provided to SSRN, Ludwig Maximilian University of Munich (LMU) - Department of Radiation Oncology, affiliation not provided to SSRN, Ludwig Maximilian University of Munich (LMU) - Department of Radiology, University Hospital Magdeburg, affiliation not provided to SSRN and affiliation not provided to SSRN

Medical University of Lodz, Medical University of Lodz, affiliation not provided to SSRN, Medical University of Lublin, IRCCS Humanitas Research Hospital, Medical University of Lodz, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Medical University of Lodz, University of Milan and Harvard University - Department of Radiation Oncology