1. Faculty of Medicine, School of Medicine, University of Belgrade, Belgrade, Serbia.
2. Center for Anesthesia and Resuscitation, Clinical Center of Serbia, Belgrade, Serbia.
3. Azienda Unità Sanitaria Locale–IRCCS di Reggio Emilia, Reggio Emilia, Italy.
4. Center for Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Section of Public Health, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy.
5. Department of Microbiology, Clinical Center of Serbia, Belgrade, Serbia.
6. Institute of Epidemiology, School of Medicine, University of Belgrade, Belgrade, Serbia.