About the Authors

Salla A Munro

To whom correspondence should be addressed. E-mail: salla.munro@mrc.ac.za

Affiliations South African Cochrane Centre, Medical Research Council of South Africa, Cape Town, South Africa , Primary Health Care Directorate, University of Cape Town, Cape Town, South Africa , Health Systems Research Unit, Medical Research Council of South Africa, Cape Town, South Africa

Simon A Lewin

Affiliations Health Systems Research Unit, Medical Research Council of South Africa, Cape Town, South Africa , Department of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, United Kingdom

Helen J Smith

Affiliation International Health Group, Liverpool School of Tropical Medicine, Liverpool, United Kingdom

Mark E Engel

Affiliations South African Cochrane Centre, Medical Research Council of South Africa, Cape Town, South Africa , Department of Medicine, University of Cape Town, Cape Town, South Africa

Atle Fretheim

Affiliation Norwegian Knowledge Centre for the Health Services, Oslo, Norway

Jimmy Volmink

Affiliations South African Cochrane Centre, Medical Research Council of South Africa, Cape Town, South Africa , University of Stellenbosch, Faculty of Health Sciences, Cape Town, South Africa

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

SAM, SAL, MEE, AF, and JV developed the protocol and conceptualised the study. All authors participated in data extraction, quality assessment tool development, quality assessment and in retrieving the studies. SAM, SAL, and HJS analysed the data, with later analysis supported by all authors. SAM wrote the initial draft; SAM, SAL, and HJS edited the manuscript; and all authors contributed to the final draft.