1 Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts. Electronic address: hwillers@mgh.harvard.edu.
2 OncoRay - National Center for Radiation Research in Oncology and Dept. of Radiotherapy & Radiation Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden; Helmholtz-Zentrum Dresden - Rossendorf, German Cancer Consortium (DKTK), Partner Site Dresden; National Center for Tumor Diseases (NCT), Partner Site Dresden; German Cancer Research Center (DKFZ), Heidelberg, Germany.
3 University of Manchester, Manchester Academic Health Science Centre, The Christie NHS Foundation Trust, United Kingdom.
4 Institute of Cancer Sciences, University of Glasgow, Glasgow, United Kingdom.