1. Department of Medical Microbiology, Faculty of Health Sciences, University of Pretoria, Pretoria, South Africa
2. Department of Medical Microbiology, School for Public Health and Primary Care (CAPRHI), Maastricht University, Maastricht, The Netherlands
3. Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
4. Centre for Tuberculosis, National Institute for Communicable Diseases, National Health Laboratory Service, Johannesburg, South Africa