1. Center of Medical Insurance, Beijing Ditan Hospital, Capital Medical University, Beijing, China
2. Center of Liver Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
3. Department of Pathology, Beijing Ditan Hospital, Capital Medical University, Beijing, China
4. Department of Medical Records and Statistics, Beijing Ditan Hospital, Capital Medical University, Beijing, China
5. National Medical Center for Infectious Disease, Beijing, China