1. Department of Hepatic Surgery, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, P. R. China
2. Guangdong Provincial Key Laboratory of Liver Disease Research, Guangzhou 510630, Guangdong Province, P. R. China
3. Department of Gastroenterology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, P. R. China
4. Department of Pathology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, P. R. China
5. Department of Medical Ultrasonics, Guangzhou First People’s Hospital, The Second Affiliated Hospital of South China University of Technology, Guangzhou 510630, Guangdong Province, P. R. China
6. Department of Intensive Care Unit, Henan Provincial People's Hospital, Zhengzhou 450003, Henan Province, P. R. China
7. Department of Biliary-Pancreatic Surgery, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, Guangdong Province, P. R. China