Specialists taking 'gatekeeper' role.
Kertesz
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D002140:California; D003422:Critical Care / Q000706:statistics & numerical data*; D007297:Inpatients; D008511:Medicine / Q000592:standards*; D010045:Outpatients; D010819:Physician's Role; D010821:Physicians, Family; D012017:Referral and Consultation / Q000592:standards*; D013038:Specialization