title: Use of the hospital emergency room in relation to use of private physicians.
mesh_terms: D000553:Ambulatory Care; D003710:Demography; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D010820:Physicians / Q000706:statistics & numerical data*; D011320:Primary Health Care; D012959:Socioeconomic Factors; D014481:United States