1. Federal University Teaching Hospital, Owerri, Nigeria
2. Igbinedion University, Okada, Nigeria
3. Imo State University, Owerri, Nigeria
4. Madonna University, Elele, Nigeria
5. Babcock University, Ilishan-Remo, Nigeria
6. Herzing University, Madison, WI
7. Richmond University Medical Center, Staten Island, NY
8. University of Ilorin, Ilorin, Nigeria.