1. Department of Integrative Biomedical Sciences University of Cape Town Observatory Cape Town 7925 South Africa
2. Department of Chemistry University of Cape Town Rondebosch Cape Town 7700 South Africa
3. Department of Biomedical Sciences Cape Peninsula University of Technology Bellville 7530 South Africa
4. Institute of Infectious Disease and Molecular Medicine University of Cape Town Observatory Cape Town 7925 South Africa
5. International Centre for Genetic Engineering and Biotechnology Observatory Cape Town 7925 South Africa
6. Department of Chemistry and Polymer Science Stellenbosch University Stellenbosch 7600 South Africa