title: Helicopter, other "air ambulances": time to assess effectiveness?
mesh_terms: D000401:Aircraft; D000552:Ambulances / Q000592:standards*; D004636:Emergency Service, Hospital / Q000458:organization & administration; D010348:Patient Care Team / Q000458:organization & administration; D012041:Regional Medical Programs / Q000458:organization & administration; D012306:Risk; D014481:United States