Research in hospital use and expenditures.
D000367:Age Factors; D005102:Health Expenditures; D006761:Hospitals / Q000706:statistics & numerical data*; D007348:Insurance, Health; D008499:Medical Records; D011364:Professional Practice; D012106:Research; D012189:Retrospective Studies; D012737:Sex Factors; D014481:United States; D014600:Utilization Review