The health insurance industry: past, present, and future.
D005544:Forecasting; D006076:Government; D006279:Health Maintenance Organizations / Q000639:trends; D049673:History, 20th Century; D007348:Insurance, Health / Q000266:history*; D006278:Medicare / Q000266:history; D011243:Preferred Provider Organizations / Q000639:trends; D014481:United States