1. Department of Paediatrics and Child Health and Tygerberg Hospital, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa
2. Ukwanda Centre for Rural Health, Department of Global Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Stellenbosch, South Africa
3. Centre for Statistical Consultation, Stellenbosch University, Stellenbosch, South Africa
4. Centre for Infectious Diseases Epidemiology & Research, School of Public Health & Family Medicine, University of Cape Town, Cape Town, South Africa
5. Vaccine Evaluation Center, Department of Pediatrics, University of British Columbia, Vancouver, Canada
6. Immunology Unit, Medical Microbiology, National Health Laboratory Service Tygerberg, Department of Pathology, Stellenbosch University, Cape Town, South Africa
7. Family Clinical Research Unit, Tygerberg Hospital and Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, Cape Town, South Africa
8. Division of Epidemiology and Biostatistics, Department of Global Health, Stellenbosch University, Cape Town, South Africa
9. Department of Psychiatry, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa