About the Authors

Saifuddin Ahmed

Affiliation Population, Family and Reproductive Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Andreea A. Creanga

acreanga@jhsph.edu

Affiliation Population, Family and Reproductive Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Duff G. Gillespie

Affiliation Population, Family and Reproductive Health Department, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America

Amy O. Tsui

Affiliation Population, Family and Reproductive Health Department, 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: SA AAC DG AT. Analyzed the data: AAC. Wrote the paper: SA AAC DG AT. Critically reviewed several versions of the manuscript: SA DG AT.