1. Department of Obstetrics and Gynecology, Center for Reproductive Medicine, Peking University Third Hospital, Beijing, China.
2. National Clinical Research Center for Obstetrics and Gynecology, Peking University Third Hospital, Beijing, China.
3. Key Laboratory of Assisted Reproduction (Peking University), Ministry of Education, Beijing, China.
4. Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology, Peking University Third Hospital, Beijing, China.
5. Clinical Epidemiology Research Center, Peking University Third Hospital, Beijing, China.
6. Department of Endocrinology and Metabolism, Peking University Third Hospital, Beijing, China.