1. Faculty of Statistics, Tianjin University of Finance and Economics, Tianjin, China.
2. Department of Statistics, Tianjin University of Finance and Economics Pearl River College, Tianjin, China.
3. Department of Liver Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), Beijing, China.
4. Department of Hepatobiliary Surgery, First Central Hospital, Tianjin, China.