1. Department of Radiation Oncology, Technical University of Munich (TUM), University Hospital rechts der Isar, Munich, Germany;
2. Department of Radiation Sciences (DRS), Institute of Innovative Radiotherapy (iRT), Helmholtz Zentrum München, Oberschleißheim, Germany;
3. Chair of Medical Education, TUM Medical Education Center, School of Medicine, Technical University of Munich (TUM), Munich, Germany;
4. Department of Radiation Sciences (DRS), Institute of Radiation Biology, Helmholtz Zentrum München, Oberschleißheim, Germany