1. Department of Surgery, Sestre Milosrdnice University Hospital Center, 10 000 Zagreb, Croatia
2. School of Medicine, University of Zagreb, 10 000 Zagreb, Croatia
3. School of Dental Medicine, University of Zagreb, 10 000 Zagreb, Croatia
4. Department of Otorhinolaryngology & Head and Neck Surgery, University Hospital Center Sestre Milosrdnice, 10 000 Zagreb, Croatia
5. Department of Pathology and Cytology, Sestre Milosrdnice University Hospital Center, 10 000 Zagreb, Croatia