The referral process.
D000046:Academic Medical Centers; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004501:Education, Medical; D005194:Family Practice; D005251:Fees, Medical; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008511:Medicine; D008875:Middle Aged; D012017:Referral and Consultation / Q000191:economics; D013038:Specialization