1. Department of Community Medicine, University of Port Harcourt Teaching Port Harcourt, Alakahia, Nigeria
2. Department of Medicine, University College Hospital, Ibadan, Nigeria
3. Department of Surgery, Obafemi Awolowo University Teaching Hospitals Complex, Ile-Ife, Nigeria
4. Dental Clinic, Kebbi Medical Centre, Kalgo, Nigeria
5. Department of Community Medicine, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
6. Department of Periodontology & Community Dentistry, University College Hospital, Ibadan, Nigeria
7. Department of Community Medicine, Afe Babalola University, Ado Ekiti, Nigeria
8. Federal Teaching Hospital, Ido Ekiti, Nigeria
9. Department of Community Medicine, University College Hospital, Ibadan, Nigeria
10. Department of Community Medicine, University of Ibadan, Ibadan, Nigeria
11. Department of Psychiatry, Lagos State University, Lagos, Nigeria
12. Department of Psychiatry, Lagos State University Teaching Hospital, Lagos, Nigeria