Emergency Medical Services of the Karlovy Vary Region, Karlovy Vary, Czech Republic. roman.sykora@zzskvk.cz.
Department of Anaesthesia and Intensive Care, Third Faculty of Medicine, Charles University and FNKV University Hospital, Prague, Czech Republic. roman.sykora@zzskvk.cz.
Medical College, Prague, Czech Republic. roman.sykora@zzskvk.cz.