The University Association for Emergency Medical Services. History and perspective.
D002170:Canada; D004632:Emergency Medical Services / Q000266:history*; D004636:Emergency Service, Hospital / Q000266:history; D013502:General Surgery / Q000266:history; D049673:History, 20th Century; D006784:Hospitals, Teaching / Q000266:history; D012955:Societies, Medical / Q000266:history*; D014481:United States