1. Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
2. Reproductive Medical Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. Reproductive Medical Center, Henan Provincial People’s Hospital, Zhengzhou, China
4. Reproductive Medical Center, the People’s Hospital of Zhengzhou University, Zhengzhou, China
5. Reproductive Medical Center, Foshan Maternal and Child Health Care Hospital, Foshan, China
6. Reproductive Medical Center, Chengdu Jinjiang Maternal and Child Health Hospital, Chengdu, China
7. Reproductive Medical Center, Shenyang women’s and children’s hospital, Shenyang, China
8. Reproductive Medical Center, Maternal and Child Health Hospital of Hubei Province, Wuhan, China
9. Department of Obstetrics and Gynecology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
10. Department of Obstetrics and Gynecology, Renhe Hospital, China Three Gorges University, Yichang, China