1. Department of Maxillofacial and Oral Surgery, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
2. Department of Periodontology and Oral Medicine, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa
3. School of Anatomical Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg 2000, South Africa
4. School of Oral Health Sciences, Sefako Makgatho Health Sciences University, Pretoria 0204, South Africa