1 Maastricht University Medical Center, Department of Radiation Oncology (Maastro Clinic), School for Oncology and Developmental Biology (GROW), Maastricht, Netherlands. dirk.deruysscher@maastro.nl.
2 Department of Radiation Oncology, Faculty of Medicine, University of Freiburg, Freiburg, Germany.
3 German Cancer Consortium (DKTK), partner site Freiburg, and German Cancer Research Centre (DKFZ), Heidelberg, Germany.
4 The Christie, Department of Radiation Oncology, Division of Cancer Sciences, University of Manchester, Manchester, UK.
5 Department of Radiation Oncology, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.
6 Sir Peter MacCallum Department of Oncology, The University of Melbourne, Parkville, Victoria, Australia.
7 Department of Clinical Oncology, The University of Hong Kong and The University of Hong Kong-Shenzhen Hospital, Hong Kong, China.
8 School of Mathematical and Physical Sciences, The University of Newcastle (UON), Newcastle, New South Wales, Australia.