1. Division of Emergency Medicine, Department of Family, Community and Emergency Care, Faculty of Health Sciences; University of Cape Town; Cape Town South Africa
2. Department of Clinical Health Sciences, School of Health Sciences, Faculty of Health, Natural Resources and Applied Sciences; Namibia University of Science and Technology; Windhoek Namibia
3. Department of Civil Engineering; University of Stellenbosch; Matieland South Africa
4. Division of Health Systems and Public Health, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa
5. Centre for Evidence-based Health Care, Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences; Stellenbosch University; Cape Town South Africa