About the Authors

Junling Gao

Affiliation School of Public Health, Fudan University, Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, China

Pinpin Zheng

Affiliation School of Public Health, Fudan University, Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, China

Hua Fu

hfu@fudan.edu.cn

Affiliation School of Public Health, Fudan University, Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JLG PPZ HF. Performed the experiments: JLG PPZ. Analyzed the data: JLG PPZ. Contributed reagents/materials/analysis tools: JLG PPZ. Wrote the paper: JLG PPZ HF.