Affiliation: | 1. Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China;2. Department of Obstetrics and Gynecology, Wuhan General Hospital of Guangzhou Military Command, Wuhan 430070, PR China;3. Department of Obstetrics and Gynecology, Wuhan Central Hospital, Wuhan 430014, PR China |