Affiliation: | 1. Department of Obstetrics and Gynecology, Yancheng City First People’s Hospital, Yancheng, 215006, China 3. Department of Pathology, Yancheng city First People’s Hospital, Yancheng, 215006, China 2. Department of Obstetrics and Gynecology, First Affiliated Hospital of Soochow University, Suzhou, 215006, China
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