1. Department of Public Health and Primary Care, University of Cambridge, Cambridge, U.K.
2. Wellcome Trust Sanger Institute, Hinxton, U.K.
3. Medical Research Council/Uganda Virus Research Institute, Uganda Research Unit on AIDS, Entebbe, Uganda
4. London School of Hygiene and Tropical Medicine, London, U.K.
5. School of International Development, University of East Anglia, Norwich, U.K.