1. Department of Odontology, School of Dentistry, Faculty of Health SciencesUniversity of PretoriaPretoriaSouth Africa
2. Department of Anatomy, School of Medicine, Faculty of Health SciencesUniversity of PretoriaPretoriaSouth Africa
3. Department of Maxillofacial and Oral Surgery, School of Dentistry, Faculty of Health SciencesUniversity of PretoriaPretoriaSouth Africa
4. Department of Statistics, Faculty of Natural and Agricultural SciencesUniversity of PretoriaPretoriaSouth Africa