The evolution of two-tiered health care.
Rafferty
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D000293:Adolescent; D000296:Adolescent Psychiatry / Q000639:trends*; D003363:Cost Control / Q000639:trends; D005380:Financing, Government / Q000639:trends*; D006301:Health Services Needs and Demand / Q000639:trends*; D006801:Humans; D012017:Referral and Consultation / Q000639:trends; D014481:United States