About the Authors

Christa L. Fischer Walker

cfischer@jhsph.edu

Affiliation Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Martin J. Aryee

Affiliation Division of Biostatistics and Bioinformatics, Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America

Cynthia Boschi-Pinto

Affiliations Department of Child and Adolescent Health and Development, World Health Organization, Geneva, Switzerland, Universidade Federal Fluminense, Rio de Janeiro, Brazil

Robert E. Black

Affiliation Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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