About the Authors

Ting Li

Affiliation Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing, China

Qinping Liao

Affiliation Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing, China

Hong Zhang

Affiliation Department of Pathology, Peking University First Hospital, Beijing, China

Xuelian Gao

Affiliation Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing, China

Xueying Li

Affiliation Department of Statistics, Peking University First Hospital, Beijing, China

Miao Zhang

mm7526@163.com

Affiliation Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MZ QL. Performed the experiments: MZ TL HZ. Analyzed the data: TL XL. Contributed reagents/materials/analysis tools: TL XG. Wrote the paper: TL. Decision to publish: MZ.