[1] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Gastrointestinal Oncol, Osaka, Japan
[2] Kumamoto Univ, Grad Sch Med Sci, Dept Surg Gastroenterol, Kumamoto, Japan
[3] Toho Univ, Sch Med, Dept Surg, Tokyo, Japan
[4] Oita Univ, Dept Surg 1, Oita 87011, Japan
[5] Gunma Univ, Grad Sch Med, Dept Gen Surg Sci Surg 1, Gunma, Japan
[6] Kanagawa Canc Ctr, Dept Gastrointestinal Surg, Yokohama, Kanagawa 2410815, Japan
[7] Kinki Univ, Dept Surg, Osakasayama, Japan
[8] Tokyo Med & Dent Univ, Dept Esophagogastr Surg, Tokyo, Japan
[9] Keio Univ, Sch Med, Dept Surg, Tokyo 160, Japan
[10] Tokyo Jikei Univ, Sch Med, Dept Internal Med, Div Clin Oncol & Hematol, Tokyo, Japan