About the Authors
- Heidi M. Soeters
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* E-mail: hsoeters@email.unc.edu
Affiliation Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Charles Poole
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Affiliation Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Monita R. Patel
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Affiliation Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
- Annelies Van Rie
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Affiliation Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
Competing Interests
MRP was a summer intern and research assistant at GlaxoSmithKline in 2010-2011. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.
Author Contributions
Conceived and designed the experiments: HMS AVR CP. Performed the experiments: HMS. Analyzed the data: HMS. Wrote the manuscript: HMS AVR CP MRP. Developed the search strategy, established inclusion criteria, reviewed abstracts: HMS AVR. Abstracted the study data: HMS MRP. Provided expertise in meta-analytic methods: CP.