The use of health services by the poor: are there any promising models?
D002648:Child; D002675:Child, Preschool; D005260:Female; D006296:Health Services / Q000706:statistics & numerical data*; D006297:Health Services Accessibility; D006801:Humans; D008962:Models, Theoretical; D011203:Poverty; D011247:Pregnancy; D014481:United States