About the Authors

Albert Y. Liu

albert.liu@sfdph.org

Affiliations San Francisco Department of Public Health, San Francisco, California, United States of America, University of California San Francisco, San Francisco, California, United States of America

Eric Vittinghoff

Affiliation University of California San Francisco, San Francisco, California, United States of America

Deborah E. Sellmeyer

Affiliation Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America

Risha Irvin

Affiliation San Francisco Department of Public Health, San Francisco, California, United States of America

Kathleen Mulligan

Affiliation University of California San Francisco, San Francisco, California, United States of America

Kenneth Mayer

Affiliation Fenway Health, Boston, Massachusetts, United States of America

Melanie Thompson

Affiliation AIDS Research Consortium of Atlanta, Atlanta, Georgia, United States of America

Robert Grant

Affiliations University of California San Francisco, San Francisco, California, United States of America, Gladstone Institutes, San Francisco, California, United States of America

Sonal Pathak

Affiliation Northrop Grumman, Atlanta, Georgia, United States of America

Brandon O'Hara

Affiliation Northrop Grumman, Atlanta, Georgia, United States of America

Roman Gvetadze

Affiliation Northrop Grumman, Atlanta, Georgia, United States of America

Kata Chillag

Affiliation Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Lisa Grohskopf

Affiliation Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America

Susan P. Buchbinder

Affiliations San Francisco Department of Public Health, San Francisco, California, United States of America, University of California San Francisco, San Francisco, California, United States of America

Competing Interests

Dr. Kenneth Mayer has received educational and research grants from Gilead Sciences, the pharmaceutical company that manufactures tenofovir. Dr. Melanie Thompson's organization (AIDS Research Consortium of Atlanta) has received research grant funding from Gilead and other pharmaceutical companies and has had a prevention research consultancy with Gilead Sciences. 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: AYL EV DES SPB. Performed the experiments: AYL K. Mulligan. Analyzed the data: AYL EV DES RI K. Mulligan K. Mayer MT RG SP BO ROG KC LG SPB. Contributed reagents/materials/analysis tools: EV. Wrote the paper: AYL EV DES RI K. Mulligan K. Mayer MT RG SP BO RG KC LG SPB.