Evaluation of century-old physical signs, S3 and S4, by modern technology.
Zoneraich
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D000818:Animals; D004285:Dogs; D006347:Heart Sounds / Q000502:physiology*; D009200:Myocardial Contraction / Q000502:physiology; D010701:Phonocardiography; D016276:Ventricular Function / Q000502:physiology