1. Department of Gastrointestinal Surgery, the First Affiliated Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, PR China
2. Administration Office of Hospital Admission & Discharge, The First Affiliated Yijishan Hospital of Wannan Medical College, Wuhu, Anhui, PR China
3. Department of General Surgery, People’s Hospital of Linquan County, Fuyang, Anhui, PR China