[1] Fourth Mil Med Univ, Natl Clin Res Ctr Digest Dis, State Key Lab Canc Biol, Xian, Peoples R China
[2] Fourth Mil Med Univ, Xijing Hosp Digest Dis, Xian, Peoples R China
[3] Xian Childrens Hosp, Dept Gastroenterol, Xian, Peoples R China
[4] Northwest Univ, Coll Chem & Mat Sci, Res Ctr Analyt Instrumentat, Key Lab Synthet & Nat Funct Mol Chem,Minist Educ, Xian, Peoples R China