1. Department of Otolaryngology, County General and Veterans Hospital Vukovar, Vukovar, Croatia
2. Department of Otorhinolaryngology and Maxillofacial Surgery, Medical Faculty, University of Osijek, Osijek, Croatia
3. Department of Neurology, Medical Faculty, University of Osijek, Osijek, Croatia
4. Department of Neurology, Clinical Hospital Center Osijek, Osijek, Croatia
5. Center for Translational and Clinical Research, University of Zagreb School of Medicine, Zagreb, Croatia
6. ENT Department, General Hospital “Josip Bencevic”, Slavonski Brod, Croatia