1. Department of Dentistry, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
2. Department of Medical Statistics and Informatics, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
3. Department of Surgery, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
4. Clinic of Surgery, University Clinical Center Kragujevac, 34000 Kragujevac, Serbia
5. Department of Internal Medicine, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
6. Clinic of Hematology, University Clinical Center Kragujevac, 34000 Kragujevac, Serbia
7. Pharmacy Institution “Zdravlje Lek”, 11000 Belgrade, Serbia
8. Clinic of Gastroenterohepatology, University Clinical Center Kragujevac, 34000 Kragujevac, Serbia