1 Department of General Surgery, Cancer Center, Division of Hepatobiliary and Pancreatic Surgery, Zhejiang Provincial People's Hospital, Affiliated People's Hospital, Hangzhou Medical College, Hangzhou, Zhejiang, China.
2 Graduate Department, Bengbu Medical College, Bengbu, Anhui, China.
3 Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Navy Medical University, Shanghai, China.
4 School of Public Health, Hangzhou Medical College, Hangzhou, Zhejiang, China.