1. Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, University of Jos (Formerly, Maxillofacial Surgery Department, Ahmadu Bello University Teaching Hospital, Shika-Zaria), Shika Zaria, Kaduna, Nigeria
2. Department of Oral and Maxillofacial Urgery, Ahmadu Bello University Teaching Hospital, Shika-Zaria, Kaduna, Nigeria
3. Department of Oral and Maxillofacial Surgery, Aminu Kano Teaching Hospital, Kano, Nigeria