The principle of referral: the gatekeeping role of the GP.
Loudon
Irvine
I
D005194:Family Practice / Q000266:history* / Q000458:organization & administration; D005260:Female; D020793:Gatekeeping / Q000266:history* / Q000458:organization & administration; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male; D012017:Referral and Consultation / Q000266:history* / Q000458:organization & administration