The silver anniversary of cardiac valve replacement.
D000818:Animals; D001021:Aortic Valve / Q000601:surgery; D001705:Bioprosthesis / Q000266:history; D006350:Heart Valve Prosthesis / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D008943:Mitral Valve / Q000601:surgery