1. Centre for HIV and STIs, National Institute for Communicable Diseases, Johannesburg, South Africa
2. Department of Clinical Microbiology and Infectious Diseases, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
3. School of Public Health, University of the Witwatersrand, Johannesburg, South Africa
4. Division of Medical Virology, Department of Pathology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
5. Westmead Clinical School and Marie Bashir Institute for Infectious Diseases and Biosecurity, University of Sydney, Westmead, New South Wales, Australia
6. Western Sydney Sexual Health Centre, Western Sydney Local Health District, Parramatta, New South Wales, Australia