1. Faculty of Medicine, University of Belgrade , dr Subotica starijeg 8, Belgrade 11000 , Serbia
2. Clinic for Orthopedic Surgery and Traumatology, University Clinical Center of Serbia , Pasterova 2, Belgrade 11000 , Serbia
3. Department of Anesthesiology , Reanimation and Intensive Care, Clinic for Orthopedic Surgery and Traumatology, , Pasterova 2, Belgrade 11000 , Serbia
4. University Clinical Center of Serbia , Reanimation and Intensive Care, Clinic for Orthopedic Surgery and Traumatology, , Pasterova 2, Belgrade 11000 , Serbia