1. University of Novi Sad, Faculty of Medicine Novi Sad + Institute of Cardiovascular Diseases of Vojvodina, Sremska Kamenica
2. University of Novi Sad, Faculty of Medicine Novi Sad + Oncology Institute of Vojvodina, Sremska Kamenica
3. University of Novi Sad, Faculty of Medicine, Novi Sad
4. University of Novi Sad, Faculty of Medicine Novi Sad + University Clinical Center of Vojvodina, Clinic of Anesthesia and Intensive Therapy, Novi Sad