[1] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Gastroenterol & Hepatol, Okayama 7008558, Japan
[2] Sano Hosp, Gastrointestinal Ctr, Kobe, Hyogo, Japan
[3] Natl Canc Ctr, Div Endoscopy, Tokyo, Japan
[4] Natl Canc Ctr Res Ctr Canc Prevent & Screening, Div Canc Screening Technol, Tokyo, Japan