1. Clinic for Anesthesia and Intensive Care, Clinical Center Nis, 18000 Nis, Serbia
2. Clinic for Cardiovascular Diseases, Clinical Center Nis, 18000 Nis, Serbia
3. Clinic for Cardiothoracic and Transplantation Surgery, Clinical Center Nis, 18000 Nis, Serbia
4. University of Nis, Medical School Nis, 18000 Nis, Serbia
5. Clinic for General Surgery, Clinical Center Nis, 18000 Nis, Serbia