1. Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
2. Heidelberg Institute of Radiation Oncology (HIRO), National Center for Radiation Research in Oncology (NCRO), 69120 Heidelberg, Germany
3. Karlsruhe Institute of Technology (KIT), Scientific Computing Center, Zirkel 2, 76131 Karlsruhe, Germany
4. Department of Radiation Oncology, Heidelberg University Hospital, 69120 Heidelberg, Germany
5. Clinical Cooperation Unit Radiation Oncology, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
6. National Center for Tumor Diseases (NCT), NCT Heidelberg, 69120 Heidelberg, Germany
7. Faculty of Physics and Astronomy, University of Heidelberg, 69120 Heidelberg, Germany
8. Department of Radiotherapy and Radiation Oncology, Marburg University Hospital, 35043 Marburg, Germany
9. Marburg Ion-Beam Therapy Center (MIT), 35043 Marburg, Germany
10. Universitäres Centrum für Tumorerkrankungen (UCT), 35033 Marburg, Germany
11. Heidelberg Ion-Beam Therapy Center (HIT), 69120 Heidelberg, Germany