The influence of the health maintenance organization experience on medical care in the United States.
D003695:Delivery of Health Care; D006125:Group Practice, Prepaid; D006279:Health Maintenance Organizations; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D007350:Insurance, Hospitalization; D009819:Office Visits; D010820:Physicians / Q000600:supply & distribution; D014481:United States