1. Centre of Hepato-Pancreato-Biliary Surgery, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
2. Department of Diagnostic Radiology, The First Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China
3. Department of Hepatobiliary Surgery, The Third Affiliated Hospital, Sun Yat-sen University , Guangzhou, Guangdong, P. R. China