1. Department of General Surgery, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.
2. Hepatobiliary Surgery, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.
3. Department of General Surgery, Qilu Hospital, Shandong University, Jinan, China.
4. Department of Microbiology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China.