Emergency medical care systems.
D003142:Communication; D003258:Consumer Behavior; D003365:Costs and Cost Analysis; D004632:Emergency Medical Services / Q000592:standards*; D005069:Evaluation Studies as Topic; D005392:First Aid; D006280:Health Workforce; D011787:Quality of Health Care; D012151:Resuscitation; D012424:Rural Population; D013997:Time Factors; D014187:Transportation of Patients / Q000592:standards; D014505:Urban Population