affiliation not provided to SSRN, affiliation not provided to SSRN, Catharina Hospital, Medical University of Vienna, Catharina Hospital, Radiotherapiegroep, University of Amsterdam - University Medical Center, affiliation not provided to SSRN, affiliation not provided to SSRN, Netherlands Cancer Institute, affiliation not provided to SSRN, University of Amsterdam - Amsterdam University Medical Centers, University of Oslo - Oslo University Hospital, University of Oslo - Oslo University Hospital, University of Oslo - Oslo University Hospital, Medical University of Vienna, Erasmus University Medical Center Rotterdam - Erasmus MC Cancer Institute, University of Amsterdam - University Medical Center and affiliation not provided to SSRN