[1] MSKCC Mem Sloan Kettering Canc Ctr, Dept Med, New York, NY USA
[2] Natl Canc Ctr Hosp East, Gastroenterol & Gastrointestinal Oncol Dept, Kashiwa, Chiba, Japan
[3] Harbin Med Univ, Harbin, Peoples R China
[4] Beijing 302 Hosp, Chinese PLA Gen Hosp, Med Ctr 5, Gastrointestinal Dept, Beijing, Peoples R China
[5] IOV Ist Oncol Veneto IRCCS, Dept Oncol, Padua, Italy
[6] Univ Hosp Brest, Dept Oncol, Brest, France
[7] Clin Alemana Temuco SA, Dept Oncol, Temuco, Chile
[8] Maria Sklodowska Curie Natl Res Inst Oncol, Dept Radiotherapy & Oncol, Warsaw, Poland
[9] Peking Univ Canc Hosp & Inst, GI Oncol Dept, Beijing, Peoples R China
[10] Minist Hlth Ukraine, Natl Canc Inst, Surg Dept, Kiev, Ukraine
[11] Ataturk Univ, Fac Med, Med Oncol Dept, Erzurum, Turkiye
[12] Yonsei Univ, Coll Med, Med Oncol Dept, Seoul, South Korea
[13] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol, Kashiwa, Chiba, Japan
[14] FALP Fdn Arturo Lopez Perez, Inst Oncol, Providencia, Chile
[15] UZ Leuven, Univ Hosp Leuven, Digest Oncol Dept, Campus Gasthuisberg, Leuven, Belgium
[16] Vall dHebron Univ Hosp, Dept Med Oncol, Barcelona, Spain
[17] Merck & Co Inc, Oncol Late Dev Dept, Rahway, NJ USA