Changes in cardiological practice over the past eighteen years.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003327:Coronary Disease / Q000453:epidemiology*; D006330:Heart Defects, Congenital / Q000453:epidemiology*; D006801:Humans; D008131:London; D008319:Malta; D012017:Referral and Consultation / Q000639:trends*; D012214:Rheumatic Heart Disease / Q000453:epidemiology*