Author information:
(1)Department of Oral Biology and Oral Pathology, School of Dentistry, Faculty 
of Health Sciences, University of Pretoria, Pretoria, South Africa.
(2)Department of Oral Biology and Oral Pathology, School of Dentistry, Faculty 
of Health Sciences, University of Pretoria, Pretoria, South Africa; Department 
of Oral Surgery and Pathology, School of Dentistry, Universidade Federal de 
Minas Gerais, Belo Horizonte, Brazil.
(3)Department of Oral Surgery and Diagnosis, Odilon Behrens Hospital, Belo 
Horizonte, Brazil.
(4)Department of Oral Biology and Oral Pathology, School of Dentistry, Faculty 
of Health Sciences, University of Pretoria, Pretoria, South Africa. Electronic 
address: willie.vanheerden@up.ac.za.