1. Maxillofacial Surgery Section, Surgery Interest Group of Africa, Zaria, Nigeria
2. Department of Dental Surgery, Ahmadu Bello University, Zaria, Nigeria
3. Faculty of Medicine, University of Algiers, Algiers, Algeria
4. School of Dentistry, University of Benin, Benin-City, Nigeria
5. Faculty of Dentistry, University of Ibadan, Ibadan, Nigeria
6. Faculty of Medicine, Alexandria University, Alexandria, Egypt
7. Neurosurgery Department, Royal Hallamshire Hospital, Sheffield, UK