Gatekeeping arrangements are in widespread use.
St Peter
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Center for Studying Health System Change, Washington, DC, USA.
D005544:Forecasting; D020793:Gatekeeping / Q000706:statistics & numerical data* / Q000639:trends; D006801:Humans; D008484:Medicaid; D006278:Medicare; D010821:Physicians, Family; D010818:Practice Patterns, Physicians'; D011320:Primary Health Care / Q000458:organization & administration*; D012017:Referral and Consultation; D014481:United States