[1] Inst Curie, INSERM, U900, Biostat Dept, F-75005 Paris, France
[2] Hokkaido Univ Hosp, Translat Res & Clin Trial Ctr, Sapporo, Hokkaido, Japan
[3] Seoul Natl Univ Coll Med, Div Oncol, Seoul, South Korea
[4] Jules Bordet Hosp, Brussels, Belgium
[5] St Marianna Univ Sch Med, Kawasaki, Kanagawa, Japan
[6] Hop Robert Debre, Dept Clin Oncol, Reims, France
[7] Dana Farber Canc Inst, Boston, MA 02115 USA
[8] Harvard Univ, Sch Publ Hlth, Dept Biostat, Boston, MA 02115 USA
[9] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[10] Univ Paris 11, Inst Gustave Roussy, Biostat & Epidemiol Dept, Villejuif, France
[11] Johannes Gutenberg Univ Mainz, Dept Med, D-55122 Mainz, Germany
[12] Yokohama City Univ, Dept Biostat & Epidemiol, Yokohama, Kanagawa, Japan
[13] Univ Tokyo, Tokyo, Japan
[14] Univ Hosp, Dept Surg, Geneva, Switzerland
[15] Univ Hosp Europeen Georges Pompidou, Gastroenterol Dept, Paris, France
[16] Tokai Cent Hosp, Sohara, Japan
[17] Mayo Clin, Div Biomed Stat & Informat, Rochester, MN USA
[18] Natl Canc Ctr Hosp East, Kashiwa, Chiba, Japan
[19] Aichi Canc Ctr Hosp, Dept Gastrointestinal Oncol, Aichi, Japan
[20] Charite, Dept Haematol Oncol & Tumorimmunol, D-13353 Berlin, Germany
[21] Univ Hosp Gasthuisberg, Digest Oncol Unit, B-3000 Louvain, Belgium
[22] Hasselt Univ, Interuniv Inst Biostat & Stat Bioinformat, Diepenbeek, Belgium
[23] Int Inst Drug Dev, Louvain, Belgium