[1] Univ Hong Kong, Div Gastroenterol & Hepatol, Dept Med, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Dept Surg Stat & Actuarial Sci, Hong Kong, Hong Kong, Peoples R China
[3] Univ Hong Kong, Dept Pathol, Hong Kong, Hong Kong, Peoples R China
[4] MD Anderson Canc Ctr, Dept Pathol, Houston, TX USA