1. Department of Ear, Nose and Throat Surgery, Federal Medical Centre, Gusau, Nigeria
2. Department of Ear, Nose and Throat Surgery, 063 Nigerian Air Force Hospital, Abuja, Nigeria
3. Department of Anaesthesia, Federal Medical Centre, Gusau, Nigeria
4. Department of Ear, Nose and Throat Surgery, University of Uyo Teaching Hospital, Akwa Ibom, Nigeria
5. Department of Ear, Nose and Throat Surgery, Air Force Hospital, Ikeja, Lagos, Nigeria