1. Cochrane South Africa, South African Medical Research Council, Cape Town, South Africa
2. Department of Nursing and Midwifery, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
3. Biostatistics Unit, South African Medical Research Council, Durban, South Africa
4. School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa
5. Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa