[1] CHU Besancon, Doubs, F-25030 Besancon, France
[2] EORTC Data Ctr, Brussels, Belgium
[3] Anticanc Ctr GF Leclerc, Dept Oncol, Dijon, France
[4] Inst Mutualiste Montsouris, Dept Oncol, Paris, France
[5] UMC Nijmegen, Nijmegen, Netherlands
[6] Hop Paul Brousse, Villejuif, France
[7] INSERM, Villejuif, France
[8] Univ Hosp Rotterdam Dijikzigt, Rotterdam, Netherlands
[9] Georges Pompidou European Hosp, Dept Gastroenterol & Digest Oncol, Paris, France
[10] Univ Rotterdam Hosp, Rotterdam, Netherlands
[11] Erasme Univ Hosp, Medicosug Dept Gastroenerol, B-1070 Brussels, Belgium
[12] Univ Hosp Gasthuisberg, Leuven, Leuven, Belgium
[13] Univ Mediterranean, Timone Hosp, Hosp Publ Assistance Marseille, Marseille, France
[14] Inst Gustave Roussy, Gastrointestinal Unit, Villejuif, France
[15] Univ Ulm, D-89069 Ulm, Germany
[16] Inst Bergonie, Ctr Comprehens Canc, Clin & Epidemiol Res Unit, Bordeaux, France
[17] Inst Canc Montpellier, Ctr Comprehens Canc, Montpellier, France
[18] Data Ctr Canc Clin Trials, CTD INCa, Montpellier, France