1. Cochrane South Africa, South African Medical Research Council, Cape Town, South Africa
2. Division of Epidemiology and Biostatistics, Department of Global Health, Stellenbosch University, Cape Town, South Africa
3. Knowledge Translation Unit, University of Cape Town Lung Institute, Cape Town, South Africa
4. Warwick Medical School - Population Evidence and Technologies, University of Warwick, Coventry, UK
5. Division of Epidemiology and Biostatistics, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa