title: An analysis of the demand for emergency ambulance service in an urban area.
mesh_terms: D000552:Ambulances / Q000706:statistics & numerical data*; D002140:California; D002641:Chicago; D004632:Emergency Medical Services / Q000706:statistics & numerical data* / Q000600:supply & distribution; D010067:Ownership; D012959:Socioeconomic Factors; D014505:Urban Population