About the Authors

Christa L. Fischer Walker, David Sack, Robert E. Black
Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Corresponding Author


Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CLFW REB. Performed the experiments: CLFW. Analyzed the data: CLFW DS. Contributed reagents/materials/analysis tools: DS. Wrote the paper: CLFW REB.