1. 1 Health Center Tutin , Serbia
2. 2 University of Kragujevac, Faculty of Medical Sciences , Department of Surgery , Kragujevac , Serbia
3. 3 University of Kragujevac , Serbia , Faculty of Medical Sciences, Center for Molecular Medicine and Stem Cell Research
4. 4 University of East Sarajevo, BiH , Medical faculty, Department of Surgery
5. 5 University of Kragujevac , Serbia , Faculty of Medical Sciences, Department of Internal medicine