1 Division of Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
2 Department of Microbiology, National Health Laboratory Service, Johannesburg, South Africa.
3 Department of Paediatrics and Child Health, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
4 Department of Microbiology, Lancet Laboratories, Johannesburg, South Africa.
5 Department of Paediatrics, Donald Gordon Medical Centre, Johannesburg, South Africa.
6 Department of Paediatrics and Child Health, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa.
7 Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
8 Department of Paediatrics and Child Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
9 Department of Paediatrics and Child Health, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.
10 Department of Paediatrics and Child Health, Christ Hani Baragwanath Academic Hospital, Johannesburg, South Africa.