1. Ear, Nose and Throat Department, Ataturk University, Erzurum, Turkey
2. Biochemistry Department, Ataturk University, Erzurum, Turkey
3. Anaesthesiology Department, Erzurum Education and Research Hospital, Erzurum, Turkey
4. Anaesthesiology Department, Erzurum Palandoken Government Hospital, Erzurum, Turkey
5. Ear, Nose and Throat Department, Malatya Government Hospital, Malatya, Turkey