1. Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
2. Center for Reproduction and Genetics, Suzhou Municipal Hospital, the Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, China
3. State Key Laboratory of Reproductive Medicine, Department of Histology and Embryology, Nanjing Medical University, Nanjing, China
4. Center of Clinical Reproductive Medicine, the Affiliated Changzhou Matemity and Child Health Care Hospital of Nanjing Medical University, Changzhou, China
5. The Affiliated Wuxi Matemity and Child Health Care Hospital of Nanjing Medical University, Wuxi, China
6. Reproductive Medicine Center, Northern Jiangsu Province Hospital, Yangzhou, China
7. Department of Obstetrics and Gynecology, Affiliated Hospital of Jiangsu University, Jiangsu University, Zhenjiang, China
8. Human Reproductive and Genetic center, Affiliated Hospital of Jiangnan University, Wuxi, China