Benefits of gatekeepers unproven.
D001291:Attitude of Health Personnel; D003362:Cost-Benefit Analysis; D003625:Data Collection; D003695:Delivery of Health Care / Q000191:economics*; D008329:Managed Care Programs / Q000191:economics*; D010820:Physicians; D012017:Referral and Consultation / Q000191:economics*; D014481:United States