[1] Fourth Mil Med Univ, Xijing Hosp Digest Dis, State Key Lab Canc Biol, Xian, Peoples R China
[2] Univ Calif Davis, Sch Med, Div Rheumatol Allergy & Clin Immunol, Davis, CA 95616 USA
[3] Univ Calif Davis, Sch Med, Div Gastroenterol & Hepatol, Davis, CA USA
[4] Fourth Mil Med Univ, Xijing Hosp Digest Dis, 127 Changle West Rd, Xian 710032, Peoples R China
[5] Fourth Mil Med Univ, Xijing Hosp Digest Dis, Xian, Peoples R China