1. Department of Obstetrics and Gynecology, Huazhong University of Science and Technology, Wuhan, China
2. Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
3. Department of Obstetrics and Gynecology, The Second People’s Hospital of Yichang, Yichang, China
4. Department of Obstetrics and Gynecology, First Affiliated Hospital, GuangXi Medical University, Nanning, China.