[1] Zhengzhou Univ, Affiliated Hosp 1, Dept Gastroenterol, Zhengzhou, Henan, Peoples R China
[2] Weifang Med Univ, Weifang Peoples Hosp, Affiliated Hosp 1, Dept Oncol, Weifang, Shandong, Peoples R China
[3] Sichuan Univ, West China Hosp 4, Noncommunicable Dis Res Ctr, West China Sch Publ Hlth,West China PUMC C C Chen, Chengdu, Peoples R China
[4] Xi An Jiao Tong Univ, Affiliated Hosp 1, Dept Gastroenterol, Xian, Peoples R China
[5] Inner Mongolia Univ Sci & Technol, Affiliated Hosp 2, Inner Mongolia Inst Digest Dis, Dept Gastroenterol,Baotou Med Coll, Baotou, Peoples R China
[6] Inner Mongolia Med Univ, Affiliated Hosp, Dept Gastroenterol, Hohhot, Peoples R China
[7] Cagliari State Univ, Dept Surg Sci, Cagliari, Italy