1. School of Health Allied Professions, Faculty of Health Sciences, University of Botswana, Gaborone, Botswana
2. Department of Biological Sciences, Faculty of Science, University of Botswana, Gaborone, Botswana
3. Research Laboratory, Botswana Harvard AIDS Institute Partnership, Gaborone, Botswana
4. Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA, USA
5. Division of Medical Virology, Stellenbosch University, Cape Town, South Africa
6. School of Health Systems of Public Health, University of Pretoria, Pretoria, South Africa