1. Project Phidisa, South African Military Health Service, Cape Town, South Africa (at the time of this work); International Partnership for Microbicides, Paarl, South Africa
2. National Institute of Allergy and Infectious Diseases (NIAID), National Institutes of Health (NIH), Bethesda, Maryland, USA (at the time of this work); University of Pennsylvania, Philadelphia, Pennsylvania, United States
3. NIH-NIAID, Division of Clinical Research, Bldg 10, Room 11C103, 10 Center Drive, MSC 1880, Bethesda, MD 20895, United States
4. Project Phidisa, South African Military Health Service, Pretoria, South Africa
5. Support to the Biostatistics Research Branch, Clinical Research Directorate/CMRP, SAIC-Frederick, Inc., NCI-Frederick, Frederick, Maryland, United States
6. South African National Defence Force, Pretoria, South Africa