Corresponding authors: KONG Beihua1, LIU Jihong2, XIE Xing3, MA Ding4. 1. Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan 250012, China, E-mail: [email protected]. Department of Gynecologic Oncology, Sun Yat-sen University Cancer Center, Guangzhou 510060, China, E-mail: [email protected]. Women's Hopital, School of Medicine Zhejiang University, Hangzhou 310006, China, E-mail: [email protected]. Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science & Technology, Wuhan 430030, China, E-mail: [email protected]
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