[1] Aarhus Univ Hosp, Dept Oncol, Noerrebrogade 44,Bldg 5, DK-8000 Aarhus C, Denmark
[2] Maastricht Univ, Med Ctr, Dept Radiat Oncol, GROW MAASTRO, NL-6200 MD Maastricht, Netherlands
[3] Catholic Univ Louvain, Dept Radiat Oncol, Leuven, Belgium
[4] Inst Verbeeten, Dept Radiat Oncol, Tilburg, Netherlands
[5] Rigshosp, Dept Oncol, DK-2100 Copenhagen, Denmark
[6] Hosp Clin Barcelona, Dept Radiat Oncol, Barcelona, Spain
[7] Inst Curie, Dept Radiat Oncol, Paris, France
[8] Erasmus Univ, Med Ctr, Dept Radiat Oncol, Rotterdam, Netherlands
[9] Clin St Elisabeth AMPR, Dept Radiat Oncol, Namur, Belgium
[10] Univ Hosp Leuven, Dept Radiat Oncol, Leuven, Belgium
[11] Hosp Univ St Joan, Dept Radiat Oncol, Reus, Spain
[12] Maria Sklodowska Curie Mem Canc Ctr, Dept Radiat Oncol, Gliwice, Poland
[13] Inst Oncol, Gliwice, Poland
[14] McGill Univ, Dept Oncol, Div Radiat Oncol, Montreal, PQ, Canada
[15] Univ Hosp, Dept Radiat Oncol, Heidelberg, Germany
[16] Tech Univ Dresden, Fac Med Carl Gustav Carus, Dresden, Germany
[17] German Canc Consortium DKTK, Dresden, Germany
[18] Canc Res Ctr DKFZ, Heidelberg, Germany
[19] Fac Med, OncoRay Natl Ctr Radiat Res Oncol, Dresden, Germany
[20] Univ Hosp Carl Gustav Carus, Dresden, Germany
[21] Helmholtz Zentrum Dresden Rossendorf, Dresden, Germany
[22] Helmholtz Zentrum Dresden Rossendorf, Inst Radiooncol, Dresden, Germany
[23] Sahlgrens Univ Hosp, Dept Oncol, Gothenburg, Sweden
[24] Inst Oncol, Dept Radiat Oncol, Ljubljana, Slovenia
[25] Hosp Univ Ramon y Cajal, Dept Radiat Oncol, Madrid, Spain
[26] Inst Canc Res, Div Radiotherapy & Imaging, Sutton, Surrey, England
[27] Royal Marsden NHS Fdn Trust, Sutton, Surrey, England
[28] Radboud Univ Nijmegen, Dept Radiat Oncol, Med Ctr, NL-6525 ED Nijmegen, Netherlands