1. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Francie van Zyl Drive, Tygerberg, 7505, Parow Cape Town Western Cape, Province South Africa 7505
2. Faculty of Medicine and Health Science, Stellenbosch University; Division of Emergency Medicine, Department of Interdisciplinary Health Sciences; PO Box 19063 Tygerberg Cape Town Western Cape South Africa 7505
3. South African Medical Research Council; South African Cochrane Centre; PO Box 19070 Tygerberg Cape Town Western Cape South Africa 7505