1 Department of Obstetrics and Gynecology, the First Affiliated Hospital, Sun Yat-sen University, 510080, Guangzhou, Guangdong, China.
2 Department of Biochemistry and Molecular Biology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, 510080, China.
3 Department of Obstetrics and Gynecology, the First Affiliated Hospital, Sun Yat-sen University, 510080, Guangzhou, Guangdong, China. liujxiu@mail.sysu.edu.cn.
4 Department of Obstetrics and Gynecology, the First Affiliated Hospital, Sun Yat-sen University, 510080, Guangzhou, Guangdong, China. wangw245@mail.sysu.edu.cn.
5 Department of Obstetrics and Gynecology, the First Affiliated Hospital, Sun Yat-sen University, 510080, Guangzhou, Guangdong, China. yaoshuzh@mail.sysu.edu.cn.