About the Authors

Annaléne Nel

Affiliation International Partnership for Microbicides, Silver Spring, Maryland United States of America

Zonke Mabude

Affiliations MatCH, Department of Obstetrics and Gynecology, University of the Witwatersrand Durban, KwaZulu-Natal, South Africa, International Partnership for Microbicides, Paarl, Western Cape, South Africa

Jenni Smit

Affiliations MatCH, Department of Obstetrics and Gynecology, University of the Witwatersrand Durban, KwaZulu-Natal, South Africa, International Partnership for Microbicides, Paarl, Western Cape, South Africa

Philip Kotze

Affiliation Qhakaza Mbokodo Research Clinic, Ladysmith, KwaZulu-Natal, South Africa

Derek Arbuckle

Affiliation PHIVA Project, Pinetown, KwaZulu-Natal, South Africa

Jian Wu

Affiliation JW Consulting, Hurstville Grove, New South Wales, Australia

Neliëtte van Niekerk

Affiliation International Partnership for Microbicides, Paarl, Western Cape, South Africa

Janneke van de Wijgert

j.vandewijgert@amc-cpcd.org

Affiliation Academic Medical Center of the University of Amsterdam and Amsterdam Institute for Global Health and Development, Amsterdam, The Netherlands

Competing Interests

Jian Wu is a consultant (JW consulting is a one person business) and was paid to conduct the statistical analyses for this paper. 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: AN JvdW. Performed the experiments: AN ZM JS PK DA. Analyzed the data: JW JvdW NvN. Wrote the paper: JvdW. Critically reviewed the manuscript: AN JvdW ZM JS PK DA NvN.