[1] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[2] Univ Florence, Careggi Univ Hosp, Clin Oncol Unit, Florence, Italy
[3] Osaka Int Canc Inst, Dept Gastroenterol Surg, Osaka, Japan
[4] Sungkyunkwan Univ, Div Hematol Oncol, Dept Med, Samsung Med Ctr,Sch Med, Seoul, South Korea
[5] Khon Kaen Univ, Dept Med, Med Oncol Unit, Fac Med, Khon Kaen, Thailand
[6] Royal Free Hosp, Dept Med Oncol, London, England
[7] Taichung Vet Gen Hosp, Div Gastroenterol, Dept Internal Med, Taichung, Taiwan
[8] Inst Invest Metab, Dept Med Oncol, Buenos Aires, Argentina
[9] MHAT Nadezhda, Dept Med Oncol, Sofia, Bulgaria
[10] Providence Canc Inst, Med Oncol & Hematol Oncol, Portland, OR USA
[11] AstraZeneca, Clin Res, Gaithersburg, MD USA
[12] AstraZeneca, Clin Res, Waltham, MA USA
[13] AstraZeneca, Clin Res, Cambridge, England
[14] Seoul Natl Univ, Coll Med, Canc Res Inst, Seoul, South Korea
[15] Seoul Natl Univ, Coll Med, Seoul Natl Univ Hosp, Div Med Oncol,Dept Internal Med, Seoul, South Korea