1 Department of Radiation Oncology, Klinikum rechts der Isar, Technische Universität München, Munich, Germany.
2 Institute for Innovative Radiotherapy (iRT), Helmholtz Zentrum München, Munich, Germany.
3 Department of Clinical Oncology, The University of Hong Kong Shenzhen Hospital, Shenzhen, China.
4 Division of Biostatistics and Bioinformatics, Department of Epidemiology and Public Health, The Greenebaum Cancer Center, School of Medicine, University of Maryland, Baltimore, MD, United States.
5 National Cancer Institute (NIH), Rockville, MD, United States.