[1] Royal Prince Alfred Hosp, AW Morrow Gastroenterol & Liver Ctr, Camperdown, NSW, Australia
[2] Univ Sydney, Cent Clin Sch, Sydney, NSW, Australia
[3] Liverpool Hosp, Dept Gastroenterol & Hepatol, Sydney, NSW, Australia
[4] Univ New South Wales, Sydney, NSW, Australia
[5] Centenary Res Inst, Inst Med Res, Camperdown, NSW, Australia
[6] Natl Univ Singapore Hosp, Div Gastroenterol & Hepatol, Dept Med, Singapore, Singapore