1. Department of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.
2. Department of Hepatobiliary Surgery, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University (Navy Medical University), Shanghai, China.
3. Department of Hepatobiliary Surgery, Sichuan Provincial People’s Hospital, Chengdu, China.
4. Department of Hepatobiliary Surgery, Affiliated Hospital of Qinghai University, Xining, China.
5. Department of Health Statistics, College of Military Preventive Medicine, Third Military Medical University (Army Medical University), Chongqing, China.
6. Hepato-pancreato-biliary Center, Tsinghua Changgung Hospital, Tsinghua University, Beijing, China.