Referral patterns in pediatric cardiology.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006331:Heart Diseases / Q000175:diagnosis*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D012017:Referral and Consultation; D012189:Retrospective Studies