Medical care of urban infants: continuity of care.
D002662:Child Health Services; D003191:Comprehensive Health Care; D004493:Education; D005006:Ethnicity; D006801:Humans; D007223:Infant; D007224:Infant Care; D010548:Personal Health Services / Q000706:statistics & numerical data; D012017:Referral and Consultation; D012923:Social Class; D012937:Social Mobility; D012959:Socioeconomic Factors; D014505:Urban Population