Salla Atkins1,2,3
, Simon Lewin1,4
, Helen Smith5
, Mark Engel6
, Atle Fretheim7
and Jimmy Volmink2,8 
1Health Systems Research Unit, Medical Research Council of South Africa, Cape Town, South Africa
2South African Cochrane Centre, Medical Research Council of South Africa, Cape Town, South Africa
3Primary Health Care Directorate, University of Cape Town, Cape Town, South Africa
4Department of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
5International Health Group, Liverpool School of Tropical Medicine, UK
6Department of Medicine, University of Cape Town, Cape Town, South Africa
7Norwegian Knowledge Centre for the Health Services, Norway
8University of Stellenbosch, Cape Town, South Africa