1. Department of Hepatic Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzho, Guangdong 510080, China
2. Department of Hepatobiliary and Pancreatic Surgery, Affiliated Hospital of Guilin Medical University, Guilin 541000, Guangxi, China
3. Department of General Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzho, Guangdong 510080, China