1 Andreas R. Thomsen MD; Peter Vaupel MD, PhD; and Anca-Ligia Grosu, MD, Department of Radiation Oncology, University Medical Center, University of Freiburg, Freiburg, Germany, and German Cancer Consortium (DKTK), Partner Site Freiburg, and German Cancer Research Center (DKFZ), Heidelberg, Germany; and Markus Notter, MD, Department of Radiation Oncology, Lindenhofspital Bern, Bern, Switzerland.