1. Clinic of Anesthesiology and Intensive Therapy, Military Medical Academy, Crnotravska 17, 11000 Belgrade, Serbia
2. Faculty of Medicine of the Military Medical Academy, University of Defense, Crnotravska 17, 11000 Belgrade, Serbia
3. Clinical Center Kragujevac, Zmaj Jovina 30, 34000 Kragujevac, Serbia
4. Faculty of Medical Sciences, University of Kragujevac, Svetozara Markovica 69, 34000 Kragujevac, Serbia
5. Institute for Infectious and Tropical Diseases, Intensive Care Unit, Clinical Center of Serbia, Pasterova 2, 11000 Belgrade, Serbia
6. School of Medicine, University of Belgrade, Dr Subotica 8, 11000 Belgrade, Serbia
7. Sector of Preventive Medicine, Military Medical Academy, Crnotravska 17, 11000 Belgrade, Serbia