Documented development of severe stenoses of previously confirmed normally functioning aortic valves.
D000368:Aged; D001021:Aortic Valve / Q000601:surgery; D001024:Aortic Valve Stenosis / Q000150:complications / Q000473:pathology* / Q000601:surgery; D002114:Calcinosis / Q000150:complications; D005260:Female; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery; D008944:Mitral Valve Insufficiency / Q000601:surgery; D008946:Mitral Valve Stenosis / Q000601:surgery; D013997:Time Factors