Auscultation of the heart since Laënnec.
D000818:Animals; D004452:Echocardiography; D006326:Heart Auscultation / Q000266:history*; D006347:Heart Sounds; D006351:Heart Valves / Q000502:physiology*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans