[1] Natl Canc Ctr, Endoscopy Div, Tokyo 1040045, Japan
[2] Jikei Univ, Sch Med, Dept Endoscopy, Tokyo, Japan
[3] Keio Univ, Sch Med, Ctr Canc, Div Res & Dev Minimally Invas Treatment, Tokyo, Japan
[4] St Marys Hosp, Dept Gastrointestinal Med, Kurume, Fukuoka, Japan
[5] Fukuoka Univ, Chikushi Hosp, Dept Gastroenterol, Fukuoka 81401, Japan
[6] Natl Canc Ctr Hosp East, Dept Gastrointestinal Oncol & Endoscopy, Kashiwa, Chiba, Japan
[7] Tochigi Canc Ctr, Dept Diagnost Imaging, Utsunomiya, Tochigi, Japan
[8] Niigata Univ, Med & Dent Hosp, Dept Endoscopy, Niigata, Japan
[9] Hiroshima Univ Hosp, Dept Endoscopy, Hiroshima, Japan
[10] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Gastrointestinal Oncol, Osaka, Japan
[11] Univ Queensland, Sch Med, Brisbane, Qld, Australia
[12] Natl Taiwan Univ Hosp, Dept Internal Med, Taipei 100, Taiwan