About the Authors

Mitchell M Conover

mconover@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

Michele Jonsson Funk

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

Alan C. Kinlaw

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

Kristy M. Borawski

Affiliation Department of Urology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Jennifer M. Wu

Affiliation Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America

Competing Interests

MJF receives research funding from AstraZeneca and from the Center for Pharmacoepidemiology (http://pharmacoepi.unc.edu/) in the Department of Epidemiology, Gillings School of Global Public Health (current members: GlaxoSmithKline, UCB BioSciences, Merck). There are no patents, products in development or marketed products to declare. 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: MMC MJF ACK JMW. Performed the experiments: MMC MJF JMW. Analyzed the data: MMC MJF ACK KMB JMW. Contributed reagents/materials/analysis tools: MJF JMW. Wrote the paper: MMC MJF ACK KMB JMW.