Author affiliations
1 Department of Medical Physics, Fakultät für Physik, Ludwig-Maximilians-Universität München (LMU Munich), Garching, Germany
2 Gradient Software, Aarhus, Denmark
3 Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
4 Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians Universität München, München, Germany
5 Excellence Cluster Universe, Garching, Germany
6 Max Planck Institute for Extraterrestrial Physics, Garching, Germany
7 German Cancer Consortium (DKTK), Munich, Germany
8 Author to whom any correspondence should be addressed.