About the Authors

Jing Guo

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

Mingjuan Jin

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

Mingwu Zhang

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

Kun Chen

ck@zju.edu.cn

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

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JG KC. Performed the experiments: JG MJ MZ. Analyzed the data: JG MZ. Contributed reagents/materials/analysis tools: MJ MZ. Wrote the paper: KC MJ.