1. Immunology & Microbiology Department, National Institute for Occupational Health, National Health Laboratory Service, Johannesburg, South Africa
2. Occupational Medicine Division and Centre for Environmental & Occupational Health, Research, School of Public Health, University of Cape Town Faculty of Health Sciences, Cape Town, South Africa
3. Department of Environmental and Occupational Studies, Cape Peninsula University of Technology (CPUT), Cape Town, South Africa
4. Brand Marketing, Ab InBev Africa South African Breweries (SAB), Sandton, South Africa