1. Department of Obstetrics and Gynecology, The First People’s Hospital of Jiangxia District, Wuhan City. Union Jiangnan Hospital Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China
2. Department of Obstetrics and Gynecology, Central People’s Hospital of Zhanjiang, Zhanjiang, Guangdong, P.R. China
3. Department of Science and Education, The First People’s Hospital of Jiangxia District, Wuhan City. Union Jiangnan Hospital Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China
4. Department of Obstetrics and Gynecology, Shenzhen Maternity &Child Healthcare Hospital, Shenzhen, Guangdong, P.R. China