About the Authors

Ning Gu

Contributed equally to this work with: Ning Gu, Tong Ru

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Tong Ru

Contributed equally to this work with: Ning Gu, Tong Ru

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Zhiqun Wang

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Yimin Dai

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Mingming Zheng

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Biyun Xu

Affiliation Department of Biostatistics, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Yali Hu

glyyhuyali@163.com

Affiliation Department of Obstetrics and Gynecology, Nanjing Drum Tower Hospital, Affiliated to Nanjing Medical University, Nanjing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: NG YH. Performed the experiments: NG TR ZW YD MZ. Analyzed the data: NG BX. Contributed reagents/materials/analysis tools: BX. Wrote the paper: NG TR YH.