1. Department of Otolaryngology-Head and Neck Surgery; University of Minnesota; Minneapolis Minnesota USA
2. Department of Otolaryngology; Showa University School of Medicine; Tokyo Japan
3. Department of Otology and Laryngology; Harvard Medical School; Boston Massachusetts USA
4. Department of Internal Medicine, Faculty of Veterinary Medicine; University of Ankara; Ankara Turkey
5. Department of Otolaryngology, Massachusetts Eye and Ear Infirmary; Boston Massachusetts USA
6. Department of Otolaryngology; University of Tokushima School of Medicine; Tokushima Japan
7. Paparella Ear Head and Neck Institute; Minneapolis Minnesota USA