1. General, Visceral and Transplant Surgery, Department of Surgery, Medical University of Graz, Auenbruggerplatz 2, 8036 Graz, Austria
2. Faculty of Medicine, Vilnius University, M. K. Ciurlionio str. 21, 03101 Vilnius, Lithuania
3. Division of Gastroenterology and Hepatology, Medical University of Graz, Auenbruggerplatz 2, 8036 Graz, Austria