[1] GATA Haydarpasa Training Hosp, Dept Otorhinolaryngol, Istanbul, Turkey
[2] Eskisehir Osmangazi Univ, Fac Med, Dept Otorhinolaryngol, Eskisehir, Turkey
[3] Medistate Hosp, Dept Otorhinolaryngol, Istanbul, Turkey
[4] Beyhekim State Hosp, Dept Psychiat, Konya, Turkey
[5] Tepecik Training Hosp, Dept Otorhinolaryngol, Izmir, Turkey
[6] Eskisehir Osmangazi Univ, Fac Med, Dept Biostat, Eskisehir, Turkey