1. University of Zagreb, School of Medicine, 10000 Zagreb, Croatia
2. Department of Surgical Oncology, University Hospital for Tumors, University Hospital Center ‘Sestre Milosrdnice’, 10000 Zagreb, Croatia
3. Department of Gastroenterology, University Hospital Center ‘Sestre Milosrdnice’, 10000 Zagreb, Croatia
4. Department of Abdominal Surgery, University Hospital Center ‘Sestre Milosrdnice’, 1000 Zagreb, Croatia