How "regular" is the "regular source of medical care"?
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003191:Comprehensive Health Care; D003710:Demography; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010372:Pediatrics; D010817:Physician-Patient Relations; D014481:United States; D000078329:Workforce