About the Authors

Zheng Xie

Contributed equally to this work with: Zheng Xie, Adrienne N. Poon

Affiliation School of Public Health, Peking University Health Science Center, Beijing, P. R. China

Adrienne N. Poon

Contributed equally to this work with: Zheng Xie, Adrienne N. Poon

Current address: Department of Medicine, School of Medicine & Health Sciences, The George Washington University, Washington, DC, United States of America

Affiliation Rutgers New Jersey Medical School, Newark, United States of America

Zhijun Wu

Affiliation School of Public Health, Peking University Health Science Center, Beijing, P. R. China

Weiyan Jian

Jianwy@126.com

Affiliation School of Public Health, Peking University Health Science Center, Beijing, P. R. China

Kit Yee Chan

Current address: Centre for Population Health Sciences, University of Edinburgh Medical School, Edinburgh, Scotland, United Kingdom

Affiliation School of Public Health, Peking University Health Science Center, Beijing, P. R. China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ZX ANP WYJ KYC. Analyzed the data: ZJW WYJ. Contributed reagents/materials/analysis tools: ZX ANP WYJ KYC. Wrote the paper: ZX ANP ZJW WYJ KYC.