1. Division of Epidemiology & Biostatistics, Faculty of Medicine & Health Sciences, Stellenbosch University, Cape Town, South Africa
2. School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. Best Health Solutions, Orange Grove, Johannesburg, South Africa
4. Division of Community Paediatrics, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
5. Department of Clinical Pharmacology, School of Medicine, Sefako Makgatho Health Science University, Pretoria, South Africa
6. The Aurum Institute, Johannesburg, South Africa