1. South African Medical Research Council; Cochrane South Africa; Francie van Zijl Drive, Parow Valley Cape Town Western Cape South Africa 7505
2. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Cape Town South Africa
3. University of the Western Cape; School of Public Health; Private Bag X17 Belville Cape Town South Africa 7535
4. J Floor, Old Groote Schuur Hospital; Department of Medicine; Observatory 7925 Cape Town South Africa
5. Medical School; Hatter Cardiovascular Research Institute; Anzio Road Observatory Cape Town South Africa 7925