1. Department of General Surgery, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi, China
2. Department of General Surgery, Shaanxi Sengong Hospital, Xi’an, Shaanxi, China
3. Department of General Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
4. Department of Emergency Surgery, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
5. Department of General Surgery, The Anhui No. 2 Provincial People’s Hospital, Hefei, Anhui, China