1 First Clinical Medical School, Lanzhou University, Lanzhou, Gansu, 730000, China; Department of Obstetrics and Gynecology, The First Hospital of Lanzhou University, Lanzhou, Gansu, 730000, China; Gansu Provincial Clinical Research Center for Gynecological Oncology, Lanzhou, Gansu, 730000, China.
2 First Clinical Medical School, Lanzhou University, Lanzhou, Gansu, 730000, China; Department of Obstetrics and Gynecology, The First Hospital of Lanzhou University, Lanzhou, Gansu, 730000, China; Gansu Provincial Clinical Research Center for Gynecological Oncology, Lanzhou, Gansu, 730000, China. Electronic address: lch@lzu.edu.cn.