1 Department of Oncology, Aarhus University Hospital, Noerrebrogade 44, Building 5, DK-8000 Aarhus C, Denmark. Electronic address: birgoffe@rm.dk.
2 Department of Radiation Oncology, Maastricht University Medical Centre - GROW (MAASTRO), Belgium.
3 Department of Radiation Oncology, Catholic University of Louvain, Belgium.
4 Department of Radiation Oncology, Institute Verbeeten, Tilburg, The Netherlands.
5 Department of Oncology, Rigshospitalet, Copenhagen, Denmark.
6 Department of Radiation Oncology, Hospital Clinic I Provincial, Barcelona, Spain.
7 Department of Radiation Oncology, Institute Curie, Paris, France.
8 Department of Radiation Oncology, Erasmus University Medical Centre, Rotterdam, The Netherlands.
9 Department of Radiation Oncology, Clinique Sainte Elisabeth (AMPR), Namur, Belgium.
10 Department of Radiation Oncology, University Hospital Leuven, Belgium.
11 Department of Radiation Oncology, Hospital Universitari Sant Joan, Reus, Spain.
12 Department of Radiation Oncology, Maria Sklodowska-Curie Memorial Cancer Centre and Institute of Oncology, Gliwice, Poland.
13 Department of Oncology, Division of Radiation Oncology, McGill University, Montréal, Canada.
14 Department of Radiation Oncology, University Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, Germany; German Cancer Consortium (DKTK), Dresden and German Cancer Research Center (DKFZ), Heidelberg, Germany; OncoRay - National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus and Helmholtz-Zentrum Dresden - Rossendorf, Dresden, Germany; Helmholtz-Zentrum Dresden - Rossendorf, Institute of Radiooncology, Dresden, Germany.
15 Department of Oncology, Sahlgrenska Universitetssjukhuset, Gothenborg, Sweden.
16 Department of Radiation Oncology, Institute of Oncology, Ljubljana, Slovenia.
17 Department of Radiation Oncology, Hospital Universitario Ramón y Cajal, Madrid, Spain.
18 Division of Radiotherapy and Imaging, Institute of Cancer Research and The Royal Marsden NHS Foundation Trust, Sutton, UK.
19 Department of Radiation Oncology, Radboud University Medical Centre, The Netherlands.