1. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + University Clinical Center of Serbia, Clinic for Otorhinolaryngology and Maxillofacial Surgery, Belgrade, Serbia
2. University of Belgrade, Faculty of Medicine, Institute of Pathology, Belgrade, Serbia
3. University Clinical Center of Serbia, Clinic for Otorhinolaryngology and Maxillofacial Surgery, Belgrade, Serbia
4. University of Belgrade, Faculty of Medicine, Belgrade, Serbia
5. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + University Clinical Center of Serbia, Clinic for Eye Diseases, Belgrade, Serbia