1. Department of Otolaryngology and Head and Neck Surgery, Semmelweis University, Szigony u. 36., H-1083 Budapest, Hungary
2. Institute of Pulmonology, H-2045 Törökbálint, Hungary
3. Department of Voice, Speech and Swallowing Therapy, Faculty of Health Sciences, Semmelweis University, H-1088 Budapest, Hungary
4. Szent István Campus, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary