1. Department of Oral and Maxillofacial Surgery, University of Benin of Benin Teaching Hospital, Benin-City, Edo State, Nigeria
2. Department of Oral and Maxillofacial Surgery, Obafemi Awolowo University Teaching Hospital, Ife, Osun State, Nigeria
3. Department of Oral and Maxillofacial Surgery, Lagos University Teaching Hospital, Lagos, Lagos State, Nigeria
4. Department of Oral and Maxillofacial Surgery, College of Medicine, University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu State, Nigeria
5. Department of Oral and Maxillofacial Surgery, Amadu Bello University Teaching Hospital, Zaria, Kaduna State, Nigeria
6. Department of Oral and Maxillofacial Surgery, University of Calabar Teaching Hospital, Calabar, Cross-River State, Nigeria
7. Department of Oral and Maxillofacial Surgery, College of Medicine, University of Ibadan, Ibadan, Nigeria