title: Clarification on heart sound.
authors.forename: Kenneth V
authors.initials: KV
authors.lastname: Robb
mesh_terms: D001024:Aortic Valve Stenosis / Q000235:genetics / Q000473:pathology / Q000503:physiopathology / Q000628:therapy; D002114:Calcinosis; D006801:Humans; D008943:Mitral Valve / Q000002:abnormalities*