A systematic approach to emergency medical services.
D000552:Ambulances / Q000592:standards; D003153:Community Health Services; D004632:Emergency Medical Services; D004636:Emergency Service, Hospital; D005260:Female; D005392:First Aid; D006275:Health Facility Planning; D006801:Humans; D008297:Male; D012947:Social Work; D012955:Societies, Medical; D014187:Transportation of Patients; D014481:United States