title: On the history of emergency medical services.
authors.affiliation: University of Pittsburgh, USA.
authors.forename: P J
authors.initials: PJ
authors.lastname: Safar
mesh_terms: D000552:Ambulances / Q000266:history*; D004632:Emergency Medical Services / Q000266:history*; D004636:Emergency Service, Hospital / Q000266:history; D049673:History, 20th Century; D006801:Humans; D014481:United States