[1] Kouseiren Takaoka Hosp, Dept Surg, Toyama, Japan
[2] Kitasato Univ, Sch Med, Dept Gastroenterol, Kanagawa, Japan
[3] Osaka Med Ctr Canc Cardiovascular Dis, Dept Gastroenterol, Osaka, Japan
[4] Iwate Med Univ, Dept Surg, Iwate, Japan
[5] Gunma Prefectural Canc Ctr, Dept Gastroenterol, Gunma, Japan
[6] Shizuoka Prefectural Gen Hosp, Dept Surg, Shizuoka, Japan
[7] Natl Hosp Org, Nagasaki Med Ctr, Dept Surg, Nagasaki, Japan
[8] Matsuyama Red Cross Hosp, Dept Surg, Ehime, Japan
[9] Kanagawa Canc Ctr, Dept Gastrointestinal Surg, Kanagawa, Japan