1. Medical Research Council/Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine (MRC/UVRI & LSHTM), Uganda Research Unit Entebbe Uganda
2. IAVI Nairobi Kenya
3. Infectious Diseases Institute College of Health Sciences Makerere University Kampala Uganda
4. IAVI New York New York USA
5. Department of Epidemiology and Biostatistics University of California San Francisco San Francisco California USA