[1] Zhengzhou Univ, Dept Gastroenterol, Affiliated Hosp 5, Kangfu St 3, Zhengzhou 450052, Henan, Peoples R China
[2] Zhengzhou Univ, Marshall BJ Med Res Ctr, Kangfu St 3, Zhengzhou 450052, Henan, Peoples R China
[3] Sichuan Univ, Dept Geriatr, West China Hosp, Chengdu, Sichuan, Peoples R China
[4] Qinghai Univ Affiliated Hosp, Dept Intens Care Med, Xining, Qinghai, Peoples R China
[5] Zhengzhou Univ, Dept Childrens Rehabil Med, Affiliated Hosp 5, Zhengzhou, Henan, Peoples R China