1. Clinic for Cardiac Surgery, Military Medical Academy, Belgrade, Serbia
2. University of Defense, Medical Faculty of the Military Medical Academy, Belgrade, Serbia
3. Primary Health Care Center, University of Montenegro-Faculty of Medicine, Podgorica, Montenegro
4. Clinic for Anesthesiology and Critical Care, Military Medical Academy, Belgrade, Serbia
5. Clinic for Cardiac Surgery, UC Clinical Centre, Belgrade, Serbia
6. University of Belgrade-Faculty of Medicine, Belgrade, Serbia
7. Department for Medical Biochemistry, University of Belgrade-Faculty of Pharmacy, Belgrade, Serbia
8. Department for Cardiac Surgery, Clinical Center of Serbia, Belgrade, Serbia