1. Department of Surgery School of Medicine and Dentistry University of Dodoma Dodoma Tanzania
2. Department of Anatomical Pathology The Benjamin Mkapa Hospital Dodoma Tanzania
3. Department of Anatomical Pathology Muhimbili National Hospital Dar es Salaam Tanzania
4. Department of Otorhinolaryngology Muhimbili University of Health and Allied Sciences Dar es Salaam Tanzania
5. Department of Otorhinolaryngology The Benjamin Mkapa Hospital Dodoma Tanzania