About the Authors

Deng Ao

Contributed equally to this work with: Deng Ao, Hai-jun Wang

Affiliations Department of Child, Adolescent and Women’s Health, School of Public Health, Peking University, Beijing, China, Key Laboratory of Reproductive Health, Ministry of Health, Beijing, China

Hai-jun Wang

Contributed equally to this work with: Deng Ao, Hai-jun Wang

Affiliations Department of Child, Adolescent and Women’s Health, School of Public Health, Peking University, Beijing, China, Key Laboratory of Reproductive Health, Ministry of Health, Beijing, China

Li-fang Wang

Affiliations Department of Child, Adolescent and Women’s Health, School of Public Health, Peking University, Beijing, China, Key Laboratory of Reproductive Health, Ministry of Health, Beijing, China

Jie-yun Song

Affiliations Department of Child, Adolescent and Women’s Health, School of Public Health, Peking University, Beijing, China, Key Laboratory of Reproductive Health, Ministry of Health, Beijing, China

Hui-xia Yang

wangyan@bjmu.edu.cn (YW); yanghuixia@bjmu.edu.cn (HY)

‡ These authors also contributed equally to this work.

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

Yan Wang

wangyan@bjmu.edu.cn (YW); yanghuixia@bjmu.edu.cn (HY)

‡ These authors also contributed equally to this work.

Affiliations Department of Child, Adolescent and Women’s Health, School of Public Health, Peking University, Beijing, China, Key Laboratory of Reproductive Health, Ministry of Health, Beijing, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DA HW YW HY. Performed the experiments: DA LW JS. Analyzed the data: DA. Contributed reagents/materials/analysis tools: HY JS. Wrote the paper: DA HW.