1. General Hospital Vrbas, Department of Anesthesia, Vrbas
2. Oncology Institute of Vojvodina, Department of Anesthesiology, Sremska Kamenica + University of Novi Sad, Faculty of Medicine, Novi Sad
3. University of Novi Sad, Faculty of Medicine, Novi Sad + Clinical Center Of Vojvodina, Clinic of Anesthesiology, Intensive Care and Pain Therapy, Novi Sad