1. Zambia Emory HIV Research Project, Lusaka, Zambia.
2. Zambia Emory HIV Research Project, Ndola, Zambia.
3. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia.
4. Rwanda Zambia HIV Research Group, Department of Pathology and Laboratory Medicine, School of Medicine, Emory University, Atlanta, Georgia.
5. International AIDS Vaccine Initiative (IAVI), New York, New York.
6. Levy Mwanawasa Medical University, Lusaka, Zambia.