About the Authors

John P. McCracken

Affiliation Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, United States of America

Joel Schwartz

Affiliation Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, United States of America

Anaite Diaz

Affiliation Center for Health Studies, Universidad del Valle de Guatemala, Guatemala City, Guatemala

Nigel Bruce

Affiliation Department of Public Health and Policy, University of Liverpool, Liverpool, United Kingdom

Kirk R. Smith

krksmith@berkeley.edu

Affiliation School of Public Health, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JPM JS KRS NB. Performed the experiments: JPM AD. Analyzed the data: JPM KRS. Wrote the paper: JPM NB KRS.