Trends in hospital use.
D001294:Attitude to Health; D006285:Health Planning; D006760:Hospitalization; D006761:Hospitals / Q000706:statistics & numerical data*; D007350:Insurance, Hospitalization; D009017:Morbidity; D010820:Physicians / Q000600:supply & distribution; D012946:Social Welfare; D013997:Time Factors; D014481:United States