[1] Ludwig Maximilians Univ Munchen, Dept Radiat Oncol, Univ Hosp, Marchioninistr 15, D-81377 Munich, Germany
[2] Sacro Cuore Don Calabria Hosp, IRCCS, Dept Adv Radiat Oncol, Negrar Verona, Italy
[3] Univ Brescia, Brescia, Italy
[4] Univ Zurich, Univ Hosp Zurich, Dept Radiat Oncol, Zurich, Switzerland
[5] Univ Montpellier, Montpellier Canc Inst, Univ Federat Radiat Oncol Montpellier Nimes, Dept Radiat Oncol,ICM,INSERM,U1194, Montpellier, France
[6] Univ Amsterdam, Med Ctr, Dept Radiat Oncol, Amsterdam, Netherlands
[7] Fdn Policlin Univ A Gemelli, IRCCS, Dept Bioimaging Radiat Oncol & Hematol, Rome, Italy
[8] Heidelberg Univ, Dept Radiat Oncol, Heidelberg, Germany
[9] German Canc Res Ctr, Clin Cooperat Unit Radiat Oncol, Heidelberg, Germany
[10] Univ Med Ctr Utrecht, Dept Radiat Oncol, Utrecht, Netherlands
[11] Royal Marsden NHS Fdn Trust, London, England
[12] Inst Canc Res, London, England
[13] Odense Univ Hosp, Dept Oncol, Odense, Denmark
[14] Univ Southern Denmark, Dept Clin Res, Odense, Denmark
[15] Univ Tubingen, Dept Radiat Oncol, Tubingen, Germany