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

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, affiliation not provided to SSRN, University Hospital Erlangen, 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, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Maria Hilf Kliniken, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Cologne - University Hospital of Cologne, affiliation not provided to SSRN, University of Cologne - University Hospital of Cologne, University of Cologne, University Hospital Magdeburg, affiliation not provided to SSRN, Asklepios Tumorzentrum Hamburg, Jena University - Jena University Hospital, affiliation not provided to SSRN, University of Göttingen - University Medical Centre, affiliation not provided to SSRN, affiliation not provided to SSRN, Goethe University Frankfurt and affiliation not provided to SSRN