1. State Key Laboratory of Reproductive Medicine Department of Histology and Embryology Suzhou Municipal Hospital Nanjing Medical University Nanjing China
2. Department of Reproduction The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University Nanjing Maternity and Child Health Care Hospital Nanjing China
3. Department of Biological Sciences Purdue University West Lafayette IN USA
4. Center for Global Health School of Public Health Nanjing Medical University Nanjing China