1. Department of ORL, Dumlupınar University, Kutahya, Turkey;
2. Department of Otolaryngology-Head and Neck Surgery, Arthur G. James Cancer Hospital and Richard J. Solove Research Institute, Comprehensive Cancer Center, the Ohio State University Wexner Medical Center, Columbus, Ohio, USA;
3. Department of Biochemistry, Dumlupınar University, Kutahya, Turkey;
4. Department of Pediatric Surgery, Dumlupınar University, Kutahya, Turkey