1. Department of Gynecology, Urumqi Youai Hospital, Urumqi, Xinjiang, P.R. China
2. Graduate School of Xinjiang Medical University, Urumqi, Xinjiang, P.R. China
3. Department of Assisted Reproduction, Urumqi Maternal and Child Health Hospital, Urumqi, Xinjiang, P.R. China
4. Department of Gynecology, Urumqi Maternal and Child Health Hospital, Urumqi, Xinjiang, P.R. China
5. Center of Reproductive Medicine, the First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang, P.R. China