[1] Univ Hosp Wurzburg, Dept Radiat Oncol, Wurzburg, Germany
[2] Goethe Univ Frankfurt, Frankfurt, Germany
[3] German Canc Consortium DKTK Partner Site, Dept Radiotherapy & Oncol, Frankfurt, Germany
[4] Univ Hosp Erlangen, Dept Radiat Oncol, Erlangen, Germany
[5] Univ Med Ctr Gottingen, Dept Gen Visceral & Paediat Surg, Gottingen, Germany
[6] Kliniken Maria Hilf GmbH Monchengladbach, Dept Haematol Oncol & Gastroenterol, Monchengladbach, Germany
[7] Univ Hosp Erlangen, Dept Surg, Erlangen, Germany
[8] Tumour Biol Ctr Freiburg, Freiburg, Germany
[9] Heidelberg Univ, Univ Hosp Mannheim, Interdisciplinary Tumour Ctr, Heidelberg, Germany
[10] Carl von Ossietzky Univ Oldenburg, Dept Gen & Visceral Surg, Oldenburg, Germany
[11] Univ Med Ctr Gottingen, Inst Pathol, Gottingen, Germany
[12] Klinikum Esslingen, Dept Surg, Esslingen, Germany
[13] DiaCura & Klinikum Coburg, Dept Radiat Oncol & Radiotherapy, Coburg, Germany
[14] Univ Hosp Carl Gustav Carus, Univ Canc Ctr, Med Dept 1, Dresden, Germany
[15] Univ Erlangen Nurnberg, Dept Med Informat Biometry & Epidemiol, Erlangen, Germany