Emergency medical services, 1979.
D000552:Ambulances / Q000592:standards; D004632:Emergency Medical Services / Q000331:legislation & jurisprudence / Q000458:organization & administration*; D004634:Emergency Medical Technicians / Q000193:education; D004635:Emergency Medicine / Q000193:education; D004636:Emergency Service, Hospital / Q000458:organization & administration; D008021:Life Support Systems; D008404:Massachusetts; D010820:Physicians; D014193:Trauma Centers; D014481:United States; D000078329:Workforce