1. Department of Otorhinolaryngology, Vukovar General Hospital, Vukovar, Croatia
2. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
3. Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
4. Department of Pathology and Cytology, University Hospital Center Zagreb, Zagreb, Croatia
5. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Center Zagreb, Zagreb, Croatia