1. ENT Department, Çiğli Regional Training Hospital, İzmir, Turkey
2. ENT Department, Eskişehir Yunus Emre State Hospital, Eskişehir, Turkey
3. ENT Department, Kırıkkale University Medical Faculty, Kırıkkale, Turkey
4. ENT Department, Cukurova Dr. Askim Tufekci State Hospital, Adana, Turkey
5. ENT Department, Eskisehir Osmangazi University Medical Faculty, Eskisehir.