1. From the Centre for Infectious Disease Epidemiology and Research
2. Health Intelligence Directorate, Western Cape Government Health and Wellness, Cape Town, South Africa
3. Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
4. Division of Public Health Medicine
5. Paediatric Infectious Diseases Unit, Red Cross War Memorial Children’s Hospital and the Department of Paediatrics and Child Health, University of Cape Town, Cape Town, South Africa
6. Division of Family Medicine, School of Public Health, University of Cape Town, Cape Town, South Africa
7. Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Worcester, South Africa.