1. Department of Periodontology and Oral Medicine; University of Limpopo; Medunsa South Africa
2. Division of Oral Pathology; School of Pathology; University of the Witwatersrand; Johannesburg South Africa
3. Department of Maxillofacial and Oral Surgery; Polokwane Mankweng Hospital; University of Limpopo; Polokwane South Africa
4. Louis Pasteur Medical Center; Pretoria South Africa