[1] Okayama Univ Hosp, Dept Endoscopy, Okayma 7008558, Japan
[2] Osaka Med Ctr Canc & Cardiovasc Dis, Dept Gastrointestinal Oncol, Osaka, Japan
[3] Univ Tokyo, Dept Endoscopy & Endoscop Surg, Tokyo 1138654, Japan
[4] Jikei Univ, Sch Med, Dept Endoscopy, Tokyo, Japan
[5] Juntendo Univ, Sch Med, Dept Human Pathol, Tokyo 113, Japan
[6] Sendai City Med Ctr, Dept Gastroenterol, Sendai, Miyagi, Japan
[7] Nagoya Univ Hosp, Dept Endoscopy, Nagoya, Aichi, Japan
[8] Kobe Univ, Grad Sch Med, Dept Internal Med, Div Gastroenterol, Kobe, Hyogo 657, Japan
[9] Niigata Univ, Grad Sch Med & Dent Sci, Div Gastroenterol, Niigata, Japan
[10] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Med, Seoul, South Korea
[11] Lyell McEwin Hosp, Adelaide, SA, Australia
[12] Chinese Peoples Liberat Army Gen Hosp, Dept Gastroenterol & Hepatol, Beijing, Peoples R China