1. University of Kragujevac, Faculty of Medical Sciences , Department of Surgery, Clinic of Pediatric Surgery, Clinical Centre Kragujevac , Kragujevac , Serbia
2. University Children‘s Hospital , Belgrade , Serbia
3. Clinical Centre Kragujevac, Clinic of Ophtalmology , Kragujevac , Serbia
4. University of Kragujevac, Faculty of Medical Sciences , Department of Surgery, Clinical Center Kragujevac, Clinic for General Surgery , Kragujevac , Serbia
5. University of Kragujevac, Faculty of Medical Sciences , Department of Pathology , Kragujevac , Serbia