1. The Second Affiliated Hospital of Nanchang University, Nanchang, P.R. China
2. Department of Obstetrics and Gynecology, Gynecology Women and Children’s Hospital of Jinzhou, Jinzhou, P.R. China
3. Department of Obstetrics and Gynecology, ShangRao Guangxin District Traditional Chinese Medicine Hospital, Shangrao, P.R. China