About the Authors

Xiaoyan Ding

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

Zi Yang

zi_yang@email.com

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

Yiwei Han

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

Huan Yu

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZY. Performed the experiments: XD YH. Analyzed the data: XD YH HY. Contributed reagents/materials/analysis tools: XD YH HY. Wrote the paper: XD ZY.