[Xiao, Han; Yan, Lupei; Li, Yuerong] Chongqing Med Univ, Affiliated Hosp 1, Dept Anesthesia, Chongqing, Peoples R China.
[Tan, Jingxing] Univ South China, Sch Nursing, Hengyang, Hunan, Peoples R China.
[Chen, Hao] Chonqing Med Univ, Sch Publ Hlth & Management, Dept Epidemiol, Chongqing, Peoples R China.
[Yao, Qin; Zhang, Yi] Chongqing Med Univ, Affiliated Hosp 1, Dept Gastrointestinal Surg, Chongqing, Peoples R China.