1 Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, 107 Wenhua Xi Road, Ji'nan, Shandong, 250012, People's Republic of China.
2 Shandong Key Laboratory of Gynecologic Oncology, Qilu Hospital of Shandong University, Ji'nan, Shandong, People's Republic of China.
3 Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, 107 Wenhua Xi Road, Ji'nan, Shandong, 250012, People's Republic of China. kongbeihua@sdu.edu.cn.
4 Shandong Key Laboratory of Gynecologic Oncology, Qilu Hospital of Shandong University, Ji'nan, Shandong, People's Republic of China. kongbeihua@sdu.edu.cn.