About the Authors

Fang Ye, Haijun Wang, Hong Zhou, Yan Wang
Division of Maternal and Child Health, School of Public Health, Peking University Beijing, Beijing, China

Dale Huntington
Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland

Yan Li, Wenlong Cui
School of Public Health, Kunming Medical College, Kunming, Yunnan, China

Fengzhi You, Meiling Yao
Women’s Healthcare Section, Zhengzhou University 3rd Affiliated Hospital Zhengzhou, Henan, China

Jinhua Li
Hebei Women and Children Health Center, Shijiazhuang, Hebei, China

Corresponding Author

wangyan@bjmu.edu.cn

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YW DH HJW HZ FY. Performed the experiments: YW HJW HZ FY YL FZY JHL WLC MLY. Analyzed the data: FY HJW. Contributed reagents/materials/analysis tools: HZ YL FZY JHL WLC MLY. Wrote the paper: FY HJW YW DH.