1. Institute of Cardiovascular Diseases of Vojvodina, Cardiology Clinic, Sremska Kamenica, Serbia
2. Institute of Cardiovascular Diseases of Vojvodina, Clinic of Cardiac Surgery, University of Novi Sad, Serbia + Faculty of Medicine, Novi Sad, Serbia
3. University of Novi Sad, Faculty of Medicine Novi Sad, Serbia + Clinical Center of Vojvodina, Clinic of Infectious Diseases, Novi Sad, Serbia
4. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia
5. University of Novi Sad, Faculty of Medicine Novi Sad, Serbia + Clinical Center of Vojvodina, Clinic of Gastroenterology and Hepatology, Novi Sad, Serbia