1. Department of Population Health, London School of Hygiene & Tropical Medicine, Keppel St, London, WC1E 7HT, England.
2. Makerere University School of Public Health, Kampala, Uganda.
3. Ifakara Health Institute, Ifakara, United Republic of Tanzania.
4. Manicaland HIV/STD Prevention Project, Harare, Zimbabwe.
5. Agincourt, Rural Public Health and Health Transitions Research Unit, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
6. African Population Health Research Center, Nairobi, Kenya.
7. London School of Hygiene & Tropical Medicine, London, England.
8. MRC/UVRI Uganda Research Unit on HIV/AIDS, Entebbe, Uganda.
9. World Health Organization, Geneva, Switzerland.
10. Consultant, Nairobi, Kenya.
11. Ministry of Health, Kampala, Uganda.
12. Ministry of Health, Lilongwe, Malawi.
13. Ministry of Health and Child Care, Harare, Zimbabwe.