1 Emergency Medical Services of the Hradec Kralove Region, Hradec Kralove, Czech Republic; Department of Anaesthesiology and Intensive Care Medicine, Charles University Prague, Faculty of Medicine Hradec Kralove, University Hospital Hradec Kralove, Czech Republic. Electronic address: anatolij.truhlar@gmail.com.
2 Department of Anaesthesiology and Intensive Care Medicine, Charles University Prague, Faculty of Medicine Hradec Kralove, University Hospital Hradec Kralove, Czech Republic; Emergency Medical Services of the Central Bohemian Region, Beroun, Czech Republic.
3 Department of Anaesthesiology and Intensive Care Medicine, Charles University Prague, Faculty of Medicine Hradec Kralove, University Hospital Hradec Kralove, Czech Republic; Department of Anesthesia, Dalhousie University, Halifax, Nova Scotia, Canada.