About the Authors

Martina Morris

morris@stat.washington.edu

Affiliation Departments of Statistics and Sociology, University of Washington, Seattle, Washington, United States of America

Helen Epstein

Affiliation New York, New York, United States of America

Maria Wawer

Affiliation Population, Family and Reproductive 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: MM MJW. Analyzed the data: MM HE. Contributed reagents/materials/analysis tools: MJW. Wrote the paper: MM HE MJW.