[1] Johns Hopkins Med Inst, Div Gastroenterol & Hepatol, Baltimore, MD 21205 USA
[2] Hop Edouard Herriot, Endoscopy & Gastroenterol Unit, Lyon, France
[3] Metropolitan Hosp Athens, Endoscopy Dept, Gastroenterol Unit, Thessaloniki, Greece
[4] Aristotle Univ Thessaloniki, Sch Med, Thessaloniki, Greece
[5] Chinese Univ Hong Kong, Div Upper GI & Metab Surg, Dept Surg, Shatin, Hong Kong, Peoples R China
[6] Fukuoka Univ, Dept Gastroenterol Surg, Fac Med, Fukuoka, Fukuoka, Japan
[7] Nagazaki Univ Hosp, Dept Gastroenterol & Hepatol, Nagazaki, Japan
[8] Johns Hopkins Med Inst, Div Gen Internal Med, Baltimore, MD 21205 USA
[9] Johns Hopkins Univ, Sch Med, Bayview Pediat, Baltimore, MD USA