1. Department of Gastrointestinal Surgery, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Huzhou, Zhejiang 313000, P.R. China
2. The Central Sterile Supply Department, Affiliated Hospital of Shandong Academy of Medical Sciences, Jinan, Shandong 250031, P.R. China
3. School of Medicine and Life Sciences, University of Jinan‑Shandong Academy of Medical Sciences, Jinan, Shandong 250062, P.R. China
4. Department of Radiotherapy, Yuncheng People's Hospital, Yuncheng, Shandong 274700, P.R. China
5. Department of Gastrointestinal Cancer Surgery, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, Shandong 250117, P.R. China