1. General Surgery Wards 5, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
2. General Surgery Wards 3, The First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
3. Department of General Surgery, Qingdao Eighth People's Hospital, Qingdao, Shandong 266000, P.R. China
4. Department of General Surgery, People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750000, P.R. China
5. Department of Endocrinology, The Third People's Hospital of Gansu Province, Lanzhou, Gansu 730000, P.R. China
6. Department of Healthcare‑Associated Infection Control, The Third People's Hospital of Gansu Province, Lanzhou, Gansu 730000, P.R. China