1 Department of Gynecology, Maternal and Child Health Hospital of Hubei Province, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
2 Department of Obstetrics and Gynecology, Zhongnan Hospital, Wuhan University, Wuhan, 430071, Hubei, China.
3 Department of Obstetrics and Gynecology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, Hubei, China.
4 Department of Obstetrics and Gynecology, Zhongnan Hospital, Wuhan University, Wuhan, 430071, Hubei, China. wonfun@whu.edu.cn.