1. Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
2. National Clinical Research Center for Obstetrical and Gynecological Diseases, Wuhan, Hubei, 430030, China
3. Key Laboratory of Cancer Invasion and Metastasis, Ministry of Education, Wuhan, Hubei, 430030, China
4. Department of Obstetrics and Gynecology, Guiyang Maternity and Child Health Care Hospital, Guizhou 550003, People's Republic of China