Letter: Echocardiographic vs anatomical "discontinuity".
D001021:Aortic Valve / Q000002:abnormalities; D004452:Echocardiography; D006330:Heart Defects, Congenital / Q000175:diagnosis*; D006801:Humans; D008943:Mitral Valve / Q000002:abnormalities; D011664:Pulmonary Valve / Q000002:abnormalities; D009626:Terminology as Topic