Staffing primary care in 1990: effects of national health insurance on staffing and costs.
D003365:Costs and Cost Analysis; D008962:Models, Theoretical; D009310:National Health Insurance, United States; D009722:Nurse Practitioners / Q000706:statistics & numerical data; D010823:Physician Assistants / Q000706:statistics & numerical data; D011320:Primary Health Care; D014481:United States; D000078329:Workforce