1. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + University Clinical Center of Serbia, Clinic for Emergency Surgery, Belgrade, Serbia
2. University Clinical Center of Serbia, Center for Radiology and Magnetic Resonance Imaging, Belgrade, Serbia
3. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + University Clinical Centre of Serbia, Center for Anesthesiology, Belgrade, Serbia
4. General hospital Novi Pazar, Department of general surgery, Novi Pazar, Serbia
5. University of Belgrade, Faculty of Medicine, Belgrade, Serbia