About the Authors

Jie Ji

Contributed equally to this work with: Jie Ji, Su-qing Wang

Affiliation School of Public Health/Global Health Institute, Wuhan University, Wuhan, Hubei Province, P. R. China

Su-qing Wang

Contributed equally to this work with: Jie Ji, Su-qing Wang

Affiliation School of Public Health/Global Health Institute, Wuhan University, Wuhan, Hubei Province, P. R. China

Yu-jian Liu

Affiliation School of Public Health/Global Health Institute, Wuhan University, Wuhan, Hubei Province, P. R. China

Qi-qiang He

heqiqiang@gmail.com

Affiliation School of Public Health/Global Health Institute, Wuhan University, Wuhan, Hubei Province, P. R. China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: QqH. Performed the experiments: QqH JJ SqW YjL. Analyzed the data: JJ. Contributed reagents/materials/analysis tools: QqH JJ SqW YjL. Wrote the paper: QqH JJ.