1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
2. School of Basic Medical Sciences, Zhengzhou University, Zhengzhou, Henan, China
3. Cancer Care Centre, St George Hospital, Level 2, Research and Education Centre, 4-10 South Street, Kogarah, NSW 2217, Australia
4. St George and Sutherland Clinical School, Faculty of Medicine and Health, UNSW Sydney, Sydney, NSW, Australia
5. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, No. 1 East Jianshe Road, Erqi District, Zhengzhou, Henan 450000, China