HMOs in Pennsylvania: how do they function?
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006279:Health Maintenance Organizations; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008875:Middle Aged; D009310:National Health Insurance, United States; D010414:Pennsylvania; D014481:United States