1. University of California, Santa Cruz, CA
2. Igbinedion University, Okada, Nigeria
3. Imo State University, Owerri, Nigeria
4. Kazan State Medical University, Kazan, Russia
5. Chukwuemeka Odumegwu Ojukwu University Teaching Hospital, Awka, Nigeria
6. Babcock University, Ilishan-Remo, Nigeria
7. Luhansk State Medical University, Luhansk, Ukraine.