1. Department of General Surgery, Shandong Provincial Qianfoshan Hospital, The First Affiliated Hospital of Shandong First Medical University, Jinan 250000, Shandong, P.R.China
2. Department of Internal Medical Oncology, Binzhou Central Hospital, Binzhou 251700, Shandong, China
3. Anesthesia Department, Binzhou Central Hospital, Binzhou 251700, Shandong, China