About the Authors

Daniel Westreich

daniel.westreich@duke.edu

Affiliations Department of Obstetrics and Gynecology, Duke Global Health Institute, Duke University, Durham, North Carolina, United States of America, Department of Epidemiology, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, United States of America

Stephen R. Cole

Affiliation Department of Epidemiology, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, United States of America

Shashi Nagar

Affiliations Clinical HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa, Right to Care, Johannesburg, South Africa

Mhairi Maskew

Affiliations Clinical HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa, Right to Care, Johannesburg, South Africa

Charles van der Horst

Affiliation Division of Infectious Diseases, Department of Medicine, University of North Carolina-Chapel Hill, Chapel Hill, North Carolina, United States of America

Ian Sanne

Affiliations Clinical HIV Research Unit, University of the Witwatersrand, Johannesburg, South Africa, Right to Care, Johannesburg, South Africa

Competing Interests

DW received an unrestricted educational training grant from the University of North Carolina-GlaxoSmithKline Center for Excellence in Pharmacoepidemiology and Public Health from 2006–2008. CvdH has conducted research studies funded by GlaxoSmithKline for examining IV zanamavir for influenza. All other authors have declared that no competing interests exist. 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: DW SC. Performed the experiments: DW SC. Analyzed the data: DW SC MM. Contributed reagents/materials/analysis tools: DW SC. Wrote the paper: DW SC SN MM CvdH IS. Collected data: SN MM IS. Data interpretation: SN MM CvdH IS.