1. Faculty of Dentistry, University of the Western Cape, Cape Town, South Africa
2. School of Dental Science, University of Nairobi, Nairobi, Kenya
3. School of Oral Health Sciences, University of Witwatersrand, Johannesburg, South Africa
4. Faculty of Dentistry, Obafemi Awolowa University, Ile-Ife, Nigeria
5. College of Medicine, Lagos State University, Lagos, Nigeria