1. Department of Infectious Diseases, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, Shandong 271000, P.R. China
2. Department of Pharmacy, Liaocheng People's Hospital, Liaocheng, Shandong 252000, P.R. China
3. Department of General Surgery, Central Hospital of Xinwen Mining Group Co., Ltd., Tai'an, Shandong 271000, P.R. China
4. Department of Hepatobiliary Surgery, Binzhou Medical University Hospital, Binzhou, Shandong 256600, P.R. China