1. Department of Otorhinolaryngoglogy (ORL); Istanbul Surgery Hospital; Istanbul Turkey
2. Department of Otorhinolaryngology (ORL); Amasya University S.S. Training and Research Hospital; Amasya
3. Department of ORL; Sakarya University Training and Research Hospital; Adapazari
4. Department of ORL; Gulhane Military Medical Academy Training Hospital; Istanbul Turkey
5. Department of Neurology; GATA Haydarpasa Training Hospital; Istanbul Turkey
6. Department of ORL; Kasımpasa Military Hospital; Istanbul Turkey
7. Smell and Taste Clinic; Department of ORL; Technische Universität Dresden; Dresden Germany