1. Zvezdara University Clinical Center, “Nikola Spasić” Surgical Clinic, Faculty of Medicine, University of Belgrade, Dimitrija Tucovica 161, 11000 Belgrade, Serbia
2. Faculty of Medicine, University of Belgrade, Dr Subotica 1, 11000 Belgrade, Serbia
3. Faculty of Dental Medicine, University of Belgrade, Dr Subotica 1, 11000 Belgrade, Serbia
4. Department of Pathological Physiology, Faculty of Medicine, University of Belgrade, Dr Subotica 1, 11000 Belgrade, Serbia
5. Department of Experimental Oncology, Institute for Oncology and Radiology of Serbia, Pasterova 14, 11000 Belgrade, Serbia