title: Doppler ultrasound and the apparently normal heart.
authors.forename: A B
authors.initials: AB
authors.lastname: Houston
mesh_terms: D015150:Echocardiography, Doppler; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging*; D006351:Heart Valves / Q000000981:diagnostic imaging*; D006801:Humans; D012213:Rheumatic Fever / Q000000981:diagnostic imaging