1. Department Otorhinolaryngology, Medical University Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria
2. First Institute of Pathology & Experimental Cancer Research, Faculty of Medicine, Semmelweis University, Üllöi út 26, 1085 Budapest, Hungary
3. Department of Otorhinolaryngology, Faculty Medical Department, Asfendiyarov Kazakh National Medical University, Specialty Otorhinolaryngology, Index 05-00-12, Almaty, Kazakhstan