About the Authors

Celeste E. Naude

cenaude@sun.ac.za

Affiliation Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa

Anel Schoonees

Affiliation Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa

Marjanne Senekal

Affiliation Division of Human Nutrition, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa

Taryn Young

Affiliations Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa, South African Cochrane Centre, South African Medical Research Council, Cape Town, South Africa

Paul Garner

Affiliation Effective Health Care Research Consortium, Department of Clinical Sciences, Liverpool School of Tropical Medicine, Liverpool, United Kingdom

Jimmy Volmink

Affiliations Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa, South African Cochrane Centre, South African Medical Research Council, Cape Town, South Africa

Competing Interests

No authors currently receive or have received funds from commercial organizations that could directly or indirectly benefit from the question addressed by this research or its findings. PG is Director of Evidence Building and Synthesis Research Consortium that receives money to increase the number of evidence-informed decisions by intermediary organizations, including WHO and national decision makers that benefit the poor in middle and low income countries. The Centre for Evidence-based Health Care at Stellenbosch University receives a grant from the Consortium for influencing evidence-informed decisions in the sub-Saharan region, and to develop capacity of researchers to respond to requests for timely, informed systematic reviews to inform national policies. The Heart and Stroke Foundation South Africa requested this review but did not contribute in any way financially or other, to its implementation. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: CN AS MS TY PG JV. Performed the experiments: CN AS. Analyzed the data: CN AS. Contributed reagents/materials/analysis tools: CN AS MS TY PG JV. Wrote the paper: CN AS MS TY PG JV.