1. Department of Paediatrics and Child Health, University of Pretoria, Private Practice, Linksfield Clinic, Johannesburg
2. Private Practice, Linksfield Clinic and Sandton Clinic, Johannesburg
3. Lancet Laboratories and Division of Medical Virology, Faculty of Health Sciences, Tygerberg Campus, Stellenbosch University
4. Lancet Laboratories, Johannesburg
5. Private Practice, Netcare Krugersdorp Hospital
6. Charlotte Maxeke Johannesburg Academic Hospital and University of the Witwatersrand, Johannesburg