About the Authors
- David M Hartley
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*To whom correspondence should be addressed. E-mail: dhartley@epi.umaryland.edu
Affiliation Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- J. Glenn Morris Jr
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Affiliation Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- David L Smith
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Affiliation Fogarty International Center, National Institutes of Health, Bethesda, Maryland, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
DMH and DLS designed the study and analyzed the data. DMH, JGM, and DLS contributed to writing the paper.