1. 1 General Hospital “Novi Pazar” , Novi Pazar , Serbia , Department of Gastroenterohepatology
2. 2 University of Kragujevac, Faculty of Medical Sciences , Department of Internal medicine , Serbia
3. 3 University of Kragujevac, Faculty of Medical Sciences , Center for Molecular Medicine and Stem Cell Research , Serbia
4. 4 University of Kragujevac, Faculty of Medical Sciences , Department of Surgery , Serbia
5. 5 Health Center Tutin , Serbia
6. 6 University of Kragujevac, Faculty of Medical Sciences , Department of Pathophysiology , Serbia
7. 7 University of Kragujevac, Faculty of Medical Sciences , Department of Pathology , Serbia