Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital Centre "Sestre milosrdnice", Vinogradska 29, 10000 Zagreb, Croatia; School of Medicine, University of Zagreb, Šalata 2b, 10000 Zagreb, Croatia. Electronic address: andro.kosec@yahoo.com. School of Medicine, University of Zagreb, Šalata 2b, 10000 Zagreb, Croatia. Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital Centre "Sestre milosrdnice", Vinogradska 29, 10000 Zagreb, Croatia. Department of Otorhinolaryngology and Head and Neck Surgery, University Hospital Centre "Sestre milosrdnice", Vinogradska 29, 10000 Zagreb, Croatia; School of Medicine, University of Zagreb, Šalata 2b, 10000 Zagreb, Croatia.