1. Department of Hepatology Division 2, Beijing Ditan Hospital, Capital Medical University, Beijing, China
2. Department of Medical Record Statistics, Beijing Ditan Hospital, Capital Medical University, Beijing, China
3. Department of Gynecology and Obstetrics, Beijing Ditan Hospital, Capital Medical University, Beijing, China
4. Department of Hepatology Division 2, Peking University Ditan Teaching Hospital, Beijing, China