1Radiation Oncology Branch, National Cancer Institute NIH, Bethesda, MD USA
2Department of Radiation Oncology, Vanderbilt University Medical Center, Nashville, TN USA
3Department of Radiation Oncology, University of California, San Francisco, USA
4Department of Radiation Oncology, Wake Forest Baptist Medical Center, Winston-Salem, NC USA
5Department of Radiation Oncology, Technical University of Munich (TUM), Munich, Germany
6Institute of Innovative Radiotherapy (iRT), Department of Radiation Sciences (DRS), Helmholtz Zentrum München, Neuherberg, Germany
7Deutsches Konsortium für Translationale Krebsforschung (DKTK) Partner Size, Munich, Germany
8Department of Radiotherapy Erlangen, Erlangen, Germany
9Department of Radiation Oncology, University of Alabama at Birmingham, Birmingham, AL USA
10UPMC Presbyterian-Shadyside, Pittsburgh, PA USA
11Department of Radiation Oncology, University of Freiburg, Freiburg, Germany
12Department of Human Oncology, University of Wisconsin, Madison, WI USA
13Department of Oncology and Palliative Medicine, Hospital Trust, 8092 Bodø, Nordland Norway
14Department of Clinical Medicine, Faculty of Health Sciences, University of Tromsø, 9038 Tromsø, Norway
15Department of Radiation Oncology, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany
16German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany
17Radiation Oncology Branch, National Cancer Institute, NIH, Bethesda, MD USA
18Department of Radiation Oncology, Washington University, St. Louis, MO USA