1. Department of Infectious Diseases, Zibo Central Hospital, Zibo, Shandong 255036, P.R. China
2. Department of Critical Care Medicine, Zibo Integrated Chinese and Western Medicine Hospital, Zibo, Shandong 255026, P.R. China
3. Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China