1. Vascular Surgery Clinic, Clinical Center Niš, Niš
2. Vascular Surgery Clinic, Clinical Center Niš, Niš + Faculty of Medicine, Niš
3. Clinic of Gastroenterology and Hepatology, Clinical Center Niš, Niš
4. Faculty of Medicine, Niš + Department of Hepatobiliary Surgery, Clinical Center Niš, Niš
5. Faculty of Medicine, Niš + Institute of Biochemistry, Faculty of Medicine, Niš
6. Department of Internal Medicine, Military Hospital, Niš, Serbia
7. Faculty of Medicine, Institute of Pathophysiology, Niš
8. Faculty of Medicine, Niš