1. Department of Otolaryngology-Head and Neck Surgery, Bandırma State Hospital, Bandırma, Balıkesir, Turkey
2. Department of Otolaryngology-Head and Neck Surgery, Ankara Research and Training Hospital, Ankara, Turkey
3. Department of Otolaryngology-Head and Neck Surgery, Kırşehir Research and Training Hospital, Kırşehir, Turkey
4. Department of Pathology, Ankara Research and Training Hospital, Ankara, Turkey