[1] Royal Prince Alfred Hosp, AW Morrow Gastroenterol & Liver Ctr, Sydney, NSW, Australia
[2] Univ Ulsan, Dept Gastroenterol, ASAN Med Ctr, Seoul, South Korea
[3] Stanford Univ, Sch Med, Div Gastroenterol & Hepatol, Palo Alto, CA 94304 USA
[4] Chinese Univ Hong Kong, Dept Med & Therapeut, Hong Kong, Peoples R China
[5] Chinese Univ Hong Kong, Dept Clin Oncol, Hong Kong, Peoples R China