1. South African Medical Research Council Vaccines and Infectious Diseases Analytics Research Unit, Faculty of Health Sciences, University of the Witwatersrand , Johannesburg , South Africa
2. Department of Science/National Research Foundation: Vaccine Preventable Diseases, University of the Witwatersrand, Faculty of Health Science , Johannesburg , South Africa
3. Department of Viroscience, Erasmus University Medical Centre , Rotterdam , the Netherlands
4. African Leadership in Vaccinology Expertise (ALIVE), Faculty of Health Sciences, University of the Witwatersrand , Johannesburg , South Africa
5. Department of Pediatrics and Child Health, Faculty of Health Sciences, University of the Witwatersrand , Johannesburg , South Africa
6. Division of Medical Virology, Department of Pathology, Stellenbosch University , Cape Town , South Africa