Invited commentary.
D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000453:epidemiology* / Q000601:surgery; D001161:Arteriosclerosis / Q000453:epidemiology*; D015897:Comorbidity; D003327:Coronary Disease / Q000453:epidemiology*; D019918:Heart Valve Prosthesis Implantation / Q000379:methods / Q000401:mortality; D006801:Humans; D016019:Survival Analysis