[1] Univ Hosp Gasthuisberg, Dept Digest Oncol, B-3000 Louvain, Belgium
[2] Natl Inst Oncol, Budapest, Hungary
[3] Univ Hosp Carl Gustav Carus, Dresden, Germany
[4] Maria Sklodowska Curie Mem Canc Ctr, Warsaw, Poland
[5] Univ Cattolica Sacro Cuore, I-00168 Rome, Italy
[6] Natl Canc Inst, Kiev, Ukraine
[7] Hosp Clin Barcelona, Barcelona, Spain
[8] Royal Marsden NHS Fdn Trust, London, England
[9] Merck KGaA, Darmstadt, Germany
[10] Onkol Klinikum Oldenburg, Oldenburg, Germany