1. The 1st Department of Gastrointestinal Surgery, Renmin Hospital of Wuhan University, Hubei Province, Wuhan 430060, P.R. China
2. Department of General Surgery, Zhongnan Hospital of Wuhan University, Hubei Province, Wuhan 430071, P.R. China
3. Emergency Center, Zhongnan Hospital of Wuhan University, Hubei Province, Wuhan 430071, P.R. China