1. Department of Maxillofacial and Oral Surgery, University of Limpopo, Medunsa Campus, Pretoria, South Africa.
2. Department of Periodontology and Oral Medicine, University of Limpopo, Medunsa Campus, Pretoria, South Africa.
3. Division of Anatomical Pathology, School of Pathology, University of the Witwatersrand, Johannesburg, South Africa.