[1] Seoul Natl Univ, Coll Med, Dept Surg, Seoul 110744, South Korea
[2] Seoul Natl Univ, Coll Med, Canc Res Inst, Seoul 110744, South Korea
[3] Asan Med Ctr, Dept Surg, Seoul, South Korea
[4] Catholic Univ, Seoul St Mary Hosp, Dept Surg, Seoul, South Korea
[5] Chonnam Natl Univ Hosp, Dept Surg, Kwangju, South Korea
[6] Kyungpook Natl Univ Hosp, Dept Surg, Taegu, South Korea
[7] Soon Chun Hyang Univ, Cheonan Hosp, Dept Surg, Cheonan, South Korea
[8] Ajou Univ Hosp, Dept Surg, Suwon, South Korea
[9] Natl Canc Ctr, Div Gastr Canc, Goyang, South Korea
[10] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Surg, Seoul, South Korea
[11] Seoul Natl Univ, Bundang Hosp, Dept Surg, Songnam, South Korea
[12] Yonsei Univ, Kangnam Severance Hosp, Dept Surg, Seoul 120749, South Korea
[13] Yonsei Univ, Severance Hosp, Dept Surg, Seoul 120749, South Korea
[14] Japanese Fdn Canc Res, Canc Inst Hosp, Tokyo, Japan
[15] Natl Canc Ctr, Tokyo 104, Japan