1. Bežanijska Kosa University Hospital Medical Center, Department for HPB Surgery, Belgrade, Serbia
2. University Clinical Centre of Serbia, Clinic for Digestive Surgery, Department for HPB Surgery, Belgrade, Serbia + University of Belgrade, Faculty of Medicine, Belgrade, Serbia
3. University of Belgrade, Faculty of Medicine, Belgrade, Serbia + University Clinical Centre of Serbia, Clinic for Digestive Surgery, Department for Colorectal Surgery, Belgrade, Serbia