Rees Helen, Holmes King
Wits Reproductive Health and HIV Institute, University of the Witwatersrand, Johannesburg, South Africa.
Department of Global Health, University of Washington, Seattle WA, USA.
Vaccine. 2014 Mar 20;32(14):1638-9. doi: 10.1016/j.vaccine.2014.01.055. Epub 2014 Jan 28.