1. Department of Otolaryngology Head & Neck Surgery University of Minnesota Minneapolis Minnesota USA
2. Department of Internal Medicine, Faculty of Veterinary Medicine Ankara University Ankara Türkiye
3. Department of Otorhinolaryngology Showa University Fujigaoka Hospital Yokohama Japan
4. Postgraduate Program in Medicine: Surgical Sciences Universidade Federal do Rio Grande do Sul (UFRGS) Porto Alegre Rs Brazil