1. Cochrane South Africa, South African Medical Research Council, Cape Town, South Africa
2. School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
3. Warwick-Centre for Applied Health Research and Delivery (WCAHRD), University of Warwick Medical School, Coventry, UK;
4. Centre for Evidence-based Health Care, Division of Epidemiology and Biostatistics, Stellenbosch University, Cape Town, South Africa