About the Authors

Jonathan E. Matthews

Affiliation Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, Georgia, United States of America

Rob Stephenson

Affiliation Hubert Department of Global Health, Emory University Rollins School of Public Health, Atlanta, Georgia, United States of America

Patrick S. Sullivan

pssulli@emory.edu

Affiliation Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, Georgia, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RS. Performed the experiments: RS PSS. Analyzed the data: JEM. Contributed reagents/materials/analysis tools: PSS. Wrote the paper: JEM PSS.