1. Cochrane South Africa; South African Medical Research Council; Cape Town South Africa
2. Division of Social and Behavioural Sciences, School of Public Health and Family Medicine; University of Cape Town; Cape Town South Africa
3. School of Public Health; University of the Western Cape; Cape Town South Africa
4. School of Public Health; Kamuzu University of Health Sciences; Blantyre Malawi
5. Department of Public Health Sciences; University of Virginia; Charlottesville Virginia USA
6. Health Systems Research Unit; South African Medical Research Council; Cape Town South Africa
7. Department of Epidemiology, School of Public Health; Brown University; Providence Rhode Island USA
8. Department of Global Health; Stellenbosch University; Cape Town South Africa
9. Division of Epidemiology and Biostatistics, School of Public Health and Family Medicine; University of Cape Town; Cape Town South Africa