About the Authors

Hui-ping Zhu

Contributed equally to this work with: Hui-ping Zhu, Xin Xia

Affiliation Department of Maternal and Child Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

Xin Xia

Contributed equally to this work with: Hui-ping Zhu, Xin Xia

Affiliation Department of Social Medicine and Health Management, School of Public Health, Wuhan University, Wuhan, China

Hui-yun Xiang

Affiliation Center for Injury Research and Policy, The Research Institute at Nationwide Children's Hospital, The Ohio State University, Columbus, Ohio, United States of America

Chuan-hua Yu

Affiliation Department of Epidemiology and Statistics, School of Public Health, Wuhan University, Wuhan, China

Yu-kai Du

birdping@163.com

Affiliation Department of Maternal and Child Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HPZ HYX YKD CHY. Performed the experiments: XX HPZ. Analyzed the data: XX. Contributed reagents/materials/analysis tools: HYX YKD CHY. Wrote the paper: XX.