1. Department for Cardiovascular Disease, Clinic for Internal Medicine, University Hospital Centre Osijek, J. Huttlera 4, 31000 Osijek, Croatia
2. Faculty of Medicine Osijek, University Josipi Juraj Strossmayer Osijek, J. Huttlera 4, 31000 Osijek, Croatia
3. Department for Gastroenterology, Clinic for Internal Medicine, University Hospital Centre Osijek, Osijek, Croatia