[1] Chiang Mai Univ, Fac Med, Dept Microbiol, Immunol Unit, Chiang Mai, Thailand
[2] Chiang Mai Univ, Fac Med, Chiang Mai, Thailand
[3] Mae Fah Luang Univ, Sch Med, Dept Surg, Chiang Rai, Thailand
[4] Weiss Mem Hosp, Dept Internal Med, Chicago, IL USA
[5] Harvard Med Sch, Mt Auburn Hosp, Dept Med, Cambridge, MA USA
[6] Stanford Univ, Sch Med, Div Gastroenterol & Hepatol, Stanford, CA USA
[7] Mayo Clin Florida, Div Gastroenterol & Hepatol, Jacksonville, FL USA
[8] Univ Arizona, Coll Med, Dept Med, Div Gastroenterol & Hepatol, Phoenix, AZ 85004 USA
[9] Banner Univ Med Ctr, Dept Internal Med, Div Gastroenterol & Hepatol, Phoenix, AZ 85006 USA
[10] Univ Michigan, Dept Internal Med, Div Gastroenterol & Hepatol, Ann Arbor, MI USA
[11] Chinese Univ Hong Kong, Inst Digest Dis, Dept Clin Oncol, Dept Med & Therapeut, Hong Kong, Peoples R China
[12] Chinese Univ Hong Kong, Inst Digest Dis, Dept Med & Therapeut, Div Gastroenterol & Hepatol, Hong Kong, Peoples R China