Affiliation: | 1. Clinic of Anesthesiology, Clinical Center of Serbia, Belgrade, Serbia;2. Institute of Epidemiology, University of Belgrade, Belgrade, Serbia;3. Faculty of Medicine, University of Belgrade, Belgrade, Serbia;4. Clinic for Physical Medicine and Rehabilitation, Clinical Center of Serbia, Belgrade, Serbia;5. Institute of Medical Statistics and Medical Informatics, University of Belgrade, Belgrade, Serbia;6. King's College Hospital, London, UK |