1. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
2. Center for Anesthesiology and Resuscitation, University Clinical Center of Serbia, 11000 Belgrade, Serbia
3. Clinic for Burns, Plastic and Reconstructive Surgery, University Clinical Center of Serbia, 11000 Belgrade, Serbia
4. Department of Medical Statistics and Informatics, School of Dental Medicine, University of Belgrade, 11000 Belgrade, Serbia
5. Clinic for Thoracic Surgery, University Clinical Center of Serbia, 11000 Belgrade, Serbia