1. Department of Histology and Embryology, Medical School Southeast University Nanjing China
2. State Key Laboratory of Reproductive Medicine Nanjing Medical University Nanjing China
3. Nanjing Maternity and Child Health Care Hospital Nanjing China
4. Reproductive Center of Second Affiliated Hospital of Nanjing Medical University Nanjing China
5. Central Laboratory Wuxi Maternity and Child Health Care Hospital Affiliated to Nanjing Medical University Wuxi China
6. Zhong Da Hospital Southeast University Nanjing China