1 Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany.
2 Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
3 Department of Radiotherapy and Radiation Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität, Dresden, Germany.
4 Department of Radiotherapy and Radiation Oncology, University Hospital, Friedrich-Schiller-University, Jena, Germany.
5 Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany.
6 Department of Radiotherapy and Oncology, University Hospital, Goethe University, Frankfurt, Germany.
7 Department of Radiation Oncology, Klinikum rechts der Isar, Technical University of Munich, School of Medicine, Munich, Germany.
8 RadioLog, Hof, Germany.
9 Department of Radiation Oncology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
10 Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany.
11 Department of Radiation Oncology, University Medical Center Göttingen, Göttingen, Germany.
12 Department of Particle Therapy, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
13 Department of Radiation Oncology, University Medical Center Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
14 Department of Radiation Oncology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin, Germany.
15 Research Unit Radiation Cytogenetics, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, Neuherberg, Germany.
16 Klinik für Radioonkologie und Strahlentherapie, Universitätsklinikum Leipzig, Leipzig, Germany.
17 Department of Radiation Oncology, Eberhard Karls Universität Tübingen, Tübingen, Germany.
18 Department of Radiation Oncology and Cyberknife Center, University Hospital of Cologne, Cologne, Germany.
19 Department of Radiotherapy and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
20 Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany. maximilian.niyazi@med.uni-muenchen.de.