1. Department of Otorhinolaryngology, Faculty of Medicine Ataturk University Erzurum Turkey
2. Department of Radiation Oncology, Faculty of Medicine Ataturk University Erzurum Turkey
3. Department of Pathology, Faculty of Veterinary Ataturk University Erzurum Turkey
4. Department of Biochemistry, Faculty of Medicine Ataturk University Erzurum Turkey