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