1. Federal University Oye-Ekiti, Oye-Ekiti, Ekiti State, Nigeria
2. ESUT Teaching Hospital, Parklane, Enugu, Nigeria
3. University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu, Nigeria
4. National Orthopaedic Hospital Enugu, Enugu, Nigeria
5. Charité – Universitätsmedizin Berlin, Berlin, Germany
6. Humboldt-Universität zu Berlin, Berlin, Germany