1. Department of Health, Grey’s Hospital, Pietermaritzburg, South Africa
2. Department of Paediatrics, Pietermaritzburg Metropolitan Hospitals Complex, Pietermaritzburg, South Africa
3. Department of Paediatrics, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
4. Department of Pediatrics, Section of Infectious Diseases at the University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA