1. Jos University Teaching Hospital, Jos, Nigeria.
2. University of Benin Teaching Hospital, Benin, Nigeria.
3. Royal Free Hospital, London, UK.
4. Royal Cornwall Hospital, Treliske, UK.
5. Federal Medical Center, Abeokuta, Nigeria.
6. College of Medicine, University of Lagos, Lagos, Nigeria.
7. College of Medicine, University of Ibadan, Oyo State, Nigeria.
8. Department of Health Sciences and Social Work, Western Illinois University, Macomb, Illinois, USA.
9. Kharkiv National Medical University, Kharkiv, Ukraine.