1. University of Kentucky, Lexington, KY
2. Lagos University Teaching Hospital, Lagos, Nigeria
3. Obafemi Awolowo University Teaching Hospital, Ile-Ife, Nigeria
4. Federal Medical Center, Abeokuta, Nigeria
5. University of Ibadan, Ibadan, Nigeria
6. Our Lady of Apostle Catholic Hospital, Ibadan, Nigeria
7. University of Arizona, Tucson, AZ
8. University of Alabama at Birmingham, Birmingham, AL