Dramatic rise in national growth of HMOs.
Studies show that HMOs have been able to lower hospital utilization rates and are introducing new elements of competition into the health care system.
D003695:Delivery of Health Care / Q000458:organization & administration; D006279:Health Maintenance Organizations / Q000458:organization & administration / Q000639:trends*; D006761:Hospitals / Q000706:statistics & numerical data; D014481:United States