1. Department of Oral Pathology Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
2. Department of Anatomical Pathology National Health Laboratory Service Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa
3. Department of Hematology and Molecular Medicine Somatic Cell Genetics Unit National Health Laboratory Service Faculty of Health Sciences University of the Witwatersrand Johannesburg South Africa