Health maintenance organizations.
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003365:Costs and Cost Analysis; D006279:Health Maintenance Organizations; D006296:Health Services / Q000706:statistics & numerical data; D006801:Humans; D007347:Insurance, Dental; D007883:Legislation, Medical; D011786:Quality Control; D011787:Quality of Health Care; D014481:United States