[1] Keio Univ, Dept Surg, Sch Med, Shinjuku Ku, 35 Shinanomachi, Tokyo 1608582, Japan
[2] Chiba Univ, Dept Radiol, Grad Sch Med, Chiba, Japan
[3] Saku Cent Hosp, Dept Gastroenterol, Nagano, Japan
[4] Natl Canc Ctr, Gastrointestinal Med Oncol Div, Tokyo, Japan
[5] Fukushima Med Univ, Dept Gastrointestinal Tract Surg, Sch Med, Fukushima, Japan
[6] Gunma Univ Hosp, Dept Endoscopy & Endoscop Surg, Maebashi, Gunma, Japan
[7] Gunma Univ, Dept Gen Surg Sci, Grad Sch Med, Maebashi, Gunma, Japan
[8] Hamamatsu Univ Sch Med, Dept Surg, Hamamatsu, Shizuoka, Japan
[9] Kyushu Natl Canc Ctr, Dept Gastroenterol Surg, Fukuoka, Fukuoka, Japan
[10] Osaka Univ, Dept Gastroenterol Surg, Grad Sch Med, Suita, Osaka, Japan
[11] Kawasaki Med Sch, Dept Gen Surg, Okayama, Japan
[12] Yamagata Univ, Dept Radiat Oncol, Sch Med, Yonezawa, Yamagata, Japan
[13] Chiba Univ, Dept Frontier Surg, Grad Sch Med, Chiba, Japan
[14] Kyoto Univ Hosp, Dept Clin Oncol, Kyoto, Japan
[15] Kyoto Prefectural Univ Med, Dept Pathol, Kyoto, Japan
[16] Int Univ Hlth & Welf, Dept Hemodialysis & Surg, Chemotherapy Res Inst, Ichikawa, Japan