Letter: Echocardiography in normal newborns.
D004452:Echocardiography; D006321:Heart / Q000033:anatomy & histology*; D006801:Humans; D007231:Infant, Newborn; D008943:Mitral Valve / Q000033:anatomy & histology; D011664:Pulmonary Valve / Q000033:anatomy & histology; D013249:Sternum / Q000033:anatomy & histology