title: Policy ... use of emergency departments.
mesh_terms: D003625:Data Collection; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D006780:Hospitals, Rural / Q000706:statistics & numerical data; D006786:Hospitals, Urban / Q000706:statistics & numerical data; D007348:Insurance, Health / Q000706:statistics & numerical data; D014481:United States