1. Cochrane South Africa; South African Medical Research Council; Cape Town South Africa
2. Centre for Evidence-based Health Care, Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa
3. Health Systems Research Unit; South African Medical Research Council; Cape Town South Africa
4. School of Applied Sciences, University of Campinas; São Paulo Brazil
5. Biostatistics Unit; South African Medical Research Council; Durban South Africa
6. School of Psychology, Faculty of Social Sciences; University of Ottawa; Ottawa Canada