[1] Kitasato Univ, Dept Gastroenterol, Sch Med, Sagamihara, Kanagawa, Japan
[2] Natl Inst Publ Hlth, Dept Hlth Promot, Wako, Saitama, Japan
[3] Natl Canc Ctr Hosp East, Dept Gastroenterol & Endoscopy, Kashiwa, Chiba, Japan
[4] Natl Canc Ctr Hosp East, Endoscopy Div, Kashiwa, Chiba, Japan
[5] Hokkaido Univ, Dept Gastroenterol, Grad Sch Med, Sapporo, Hokkaido, Japan
[6] Ishikawa Prefectural Cent Hosp, Dept Gastroenterol, Kanazawa, Ishikawa, Japan
[7] Tohoku Univ, Div Gastroenterol, Grad Sch Med, Sendai, Miyagi, Japan
[8] Shizuoka Canc Ctr, Div Endoscopy, Shizuoka, Japan
[9] Natl Hosp Org Osaka Natl Hosp, Dept Surg, Osaka, Japan
[10] Okayama Univ, Dept Gastroenterol & Hepatol, Grad Sch Med, Okayama, Japan
[11] Kyoto Prefectural Univ Med, Dept Mol Targeting Canc Prevent, Kyoto, Japan
[12] Natl Hosp Org Kurihama Med & Addict Ctr, Clin Res Unit, Yokosuka, Kanagawa, Japan
[13] Kyoto Univ Hosp, Dept Clin Oncol, Kyoto, Japan