1. Department of Gynecology and Obstetrics, Beijing Ditan Hospital, Capital Medical University, Beijing, China
2. Department of Hepatology Division 2, Peking University Ditan Teaching Hospital, Beijing, China
3. Department of Hepatology Division 2, Beijing Ditan Hospital, Capital Medical University, Beijing, China
4. Department of Child Health Care, Beijing Children’s Hospital, Capital Medical University, Beijing, China
5. Medical Records and Statistics Room, Beijing Ditan Hospital, Capital Medical University, Beijing, China