1. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
2. These authors contributed equally to this article.
3. Department of Obstetrics and Gynecology, Women’s Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China
4. Ranran Tang and Xue Zhou are joint corresponding authors to this paper.