1. School of Public Health; University of the Western Cape; Cape Town South Africa
2. Chronic Disease Initiative for Africa, Department of Medicine; University of Cape Town; Cape Town South Africa
3. KEMRI-Wellcome Trust Research Programme; Kilifi Kenya
4. Cochrane South Africa; South African Medical Research Council; Cape Town South Africa
5. HIV and other Infectious Diseases Research Unit; South African Medical Research Council; Durban 4901 South Africa
6. University of Virginia; Charlottesville USA