[1] Chinese Acad Med Sci & Peking Union Med Coll, Peking Union Med Coll Hosp, Dept Gastroenterol, Beijing 100730, Peoples R China
[2] Qingdao Univ, Affiliated Hosp, Dept Gastroenterol, Qingdao, Shandong, Peoples R China
[3] Shandong Univ, Qilu Hosp, Dept Gastroenterol, Jinan, Shandong, Peoples R China
[4] Shanxi Med Univ, Hosp 1, Dept Gastroenterol, Taiyuan, Shanxi, Peoples R China
[5] Shanghai Jiao Tong Univ, Div Gastroenterol & Hepatol, Key Lab Gastroenterol & Hepatol, Minist Hlth,Inflammatory Bowel Dis Res Ctr,Shangha, Shanghai, Peoples R China
[6] Chinese Acad Med Sci, Peking Union Med Coll Hosp, Peking Union Med Coll, Med Res Ctr, Beijing, Peoples R China
[7] Hebei Med Univ, Hosp 2, Dept Gastroenterol, Shijiazhuang 050000, Peoples R China