1. Department of Oral and Maxillofacial Pathology, School of Dentistry, Faculty of Health Sciences University of Pretoria Pretoria South Africa
2. Private Statistician Cape Town South Africa
3. Department of Oral Surgery and Pathology, School of Dentistry Federal University of Minas Gerais (UFMG) Belo Horizonte Brazil
4. Department of Anatomy, School of Medicine, Faculty of Health Sciences University of Pretoria Pretoria South Africa