1 Prague Emergency Medical Services, Prague, Czech Republic; 3rd Faculty of Medicine, Charles University in Prague, Czech Republic. Electronic address: david.peran@seznam.cz.
2 Emergency Medical Services of the Usti nad Labem Region, Czech Republic; Jan Evangelista Purkyne University, Faculty of Health Studies, Usti nad Labem, Czech Republic.
3 Prague Emergency Medical Services, Prague, Czech Republic; Medical College, Prague, Czech Republic.