1. Clinical Center Niš, Department for Cardiovascular Diseases, Obstetrics and Gynecology Clinic, Niš, Serbia + University of Niš, Faculty of Medicine, Niš, Serbia
2. Military Medical Academy, Clinic of Internal Emergency Medicine, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
3. Clinical Center Niš, Center of Anesthesiology, Niš, Serbia
4. Institute for Treatment and Rehabilitation Niška Banja, Niška Banja, Serbia
5. Mother and Child Health Care Institute „Dr Vukan Čupić“, Department of Anesthesiology and Intensive Care, Belgrade, Serbia
6. University of Niš, Faculty of Medicine, Niš, Serbia + University of Niš, Innovation Center, Niš, Serbia