1. Faculty of Medical Sciences, University of Kragujevac , Kragujevac , Serbia
2. Clinic of Internal Medicine, Clinical Center Kragujevac , Kragujevac , Serbia
3. Department of Biochemistry , Faculty of Medical Sciences, University of Kragujevac , Kragujevac , Serbia
4. Clinic of Urology, Nephrology and Dialysis , University Clinical Center Kragujevac , Kragujevac , Serbia
5. Faculty of Medicine, University of Belgrade , Belgrade , Serbia
6. University Hospital Center “Dr Dragisa Misovic - Dedinje” , Belgrade , Serbia