About the Authors
- Neff Walker
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Affiliation Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America
- Kenneth Hill
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* E-mail: kenneth_hill_1@yahoo.com
Affiliation Harvard School of Public Health, Harvard University, Cambridge, Massachusetts, United States of America
- Fengmin Zhao
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Affiliation Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Wrote the first draft of the manuscript: KH NW. Contributed to the writing of the manuscript: KH NW. ICMJE criteria for authorship read and met: NW KH FZ. Agree with manuscript results and conclusions: NW KH FZ. Conceived the analysis: NW. Collaborated on design of the analysis: KH. Performed the analysis: KH FZ. Analyzed the results: NW KH.