1. Department of Epidemiology and Biostatistics, First Affiliated Hospital, Army Medical University, Chongqing, PR China
2. Institute of Hepatobiliary Surgery, Southwest Hospital, Army Medical University, Chongqing, PR China
3. Department of Radiation, Southwest Hospital, Army Medical University, Chongqing, PR China
4. Department of Hepatobiliary Surgery, Xinqiao Hospital, Army Medical University, Chongqing, PR China
5. Department of Hepatobiliary Surgery, Daping Hospital, Army Medical University, Chongqing, PR China