Venter W D Francois, Ndung'u Thumbi, Karim Quarraisha Abdool
Wits Reproductive Health and HIV Institute and the Department of Medicine, University of the Witwatersrand, Johannesburg, South Africa.
N Engl J Med. 2011 May 19;364(20):1956-64. doi: 10.1056/NEJMcpc1100926.