1. Department of Medical Physics Faculty of Physics Ludwig‐Maximilians‐Universität München Am Coulombwall 1 85748 Garching b. München Germany
2. Univ Lyon INSA‐Lyon Université Claude Bernard Lyon 1 UJM‐Saint Étienne CNRS, Inserm CREATIS UMR 5220 U1206 F‐69373 Lyon France
3. Northwestern Medicine Chicago Proton Center Warrenville IL 60555 USA
4. Department of Physics University of California Santa Cruz Santa Cruz CA 95064 USA
5. Division of Biomedical Engineering Sciences Loma Linda University Loma Linda CA 92354 USA
6. Department of Radiation Oncology University Hospital, LMU Munich 81377 Munich Germany
7. German Cancer Consortium (DKTK) 81377 Munich Germany