Trends in personnel expenses.
D001723:Birth Rate; D003365:Costs and Cost Analysis; D006801:Humans; D007902:Length of Stay; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data; D010343:Patient Admission; D010557:Personnel Administration, Hospital / Q000191:economics*; D012456:Salaries and Fringe Benefits / Q000639:trends*; D014481:United States