1. Division of Health Systems and Public Health, Department of Global Health, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa
2. South African Medical Research Council; Burden of Disease Research Unit; Cape Town South Africa
3. Centre for Evidence-based Health Care, Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa
4. Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa