affiliation not provided to SSRN, LMU University Hospital, 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, Charité - Universitätsmedizin Berlin, affiliation not provided to SSRN, affiliation not provided to SSRN, Universitätsklinikum Leipzig, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Heinrich Heine University Dusseldorf - Department of Radiation Oncology, Heinrich Heine University Dusseldorf - Department of Radiation Oncology, 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, Ludwig Maximilian University of Munich (LMU) - Department of Radiation Oncology, Ludwig Maximilians University LMU University Hospital Munich, LMU University Hospital and affiliation not provided to SSRN

affiliation not provided to SSRN, Leiden University - Leiden University Medical Center (LUMC), Leiden University - Department of Medical Statistics, Erasmus MC - Brain Tumor Centre, Netherlands Cancer Institute - Division of Psychosocial Research and Epidemiology, affiliation not provided to SSRN, affiliation not provided to SSRN, KU Leuven, European Organisation for Research and Treatment of Cancer (EORTC), EORTC Headquarters, University of Bonn - University Hospital Bonn (UKB), University Hospital Zurich, affiliation not provided to SSRN, Université de Lille - Laboratoire Protéomique, affiliation not provided to SSRN, affiliation not provided to SSRN, Medical University of Vienna, affiliation not provided to SSRN, affiliation not provided to SSRN, International BrainTumour Alliance, IRCCS Regina Elena National Cancer Institute, affiliation not provided to SSRN, University of Amsterdam - Amsterdam University Medical Centers, affiliation not provided to SSRN, University Hospital Zurich, Universitätsklinikum Leipzig, University of Lausanne, Heidelberg University - University Hospital Heidelberg, University Hospital Zurich, Leiden University - Leiden University Medical Center (LUMC) and affiliation not provided to SSRN

affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Universitätsklinikum Leipzig, Charité - Universitätsmedizin Berlin, Charité - Universitätsmedizin Berlin, affiliation not provided to SSRN, affiliation not provided to SSRN, Universitätsklinikum Münster, Universitätsklinikum Münster, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Hannover Medical School, University of Münster, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Freiburg - Medical Center, affiliation not provided to SSRN, Technische Universität München (TUM), affiliation not provided to SSRN, Universitätsklinikum Leipzig and Universitätsklinikum Leipzig