1. Department of Obstetrics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
2. Joint International Research Laboratory of Reproduction and Development of Chinese Ministry of Education, Chongqing Medical University, Chongqing, China
3. Chongqing Key Laboratory of Maternal and Fetal Medicine, Chongqing Medical University, Chongqing, China
4. Department of Obstetrics, Health Center for Women and Children, Chongqing, China
5. Center for Reproductive Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China