1 Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China.
2 Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China; Department of Clinical Medicine, Second Military Medical University, Shanghai 200433, China.
3 Department of Health Statistics, Second Military Medical University, Shanghai 200433, China.
4 Medical Scientific Affairs, Abbott Diagnostics, Shanghai 200003, China.
5 Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai 200438, China. Electronic address: yangtiandfgd@hotmail.com.