1. School of Public Health Xinjiang Medical University Urumqi P. R. China
2. The First Affiliated Hospital of Xinjiang Medical University Urumqi P. R. China
3. Center of Reproductive Medicine the First Affiliated Hospital of Xinjiang Medical University Urumqi P. R. China
4. Gynecology Department the First Affiliated Hospital of Xinjiang Medical University Urumqi P. R. China