1. Department of Gynecology and Obstetrics, Jiangxi Medical College, Graduate School of Nanchang University, Nanchang, Jiangxi 330031, P.R. China
2. Key Laboratory of Women's Reproductive Health of Jiangxi Province, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, Jiangxi 330006, P.R. China
3. Reproductive Medicine Center, Jiangxi Provincial Maternal and Child Health Hospital, Nanchang, Jiangxi 330006, P.R. China