Improving attendance at follow-up clinics.
D000293:Adolescent; D002648:Child; D006330:Heart Defects, Congenital / Q000628:therapy; D006801:Humans; D008134:Long-Term Care; D010044:Outpatient Clinics, Hospital; D010349:Patient Compliance; D012214:Rheumatic Heart Disease / Q000175:diagnosis