title: Design flaws make conclusions difficult.
authors.forename: Nishith
authors.initials: N
authors.lastname: Patel
mesh_terms: D000369:Aged, 80 and over; D001021:Aortic Valve / Q000601:surgery*; D001705:Bioprosthesis; D019917:Blood Vessel Prosthesis Implantation / Q000379:methods; D015331:Cohort Studies; D005260:Female; D015577:Geriatric Assessment; D006349:Heart Valve Diseases / Q000601:surgery; D006350:Heart Valve Prosthesis; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012107:Research Design; D012189:Retrospective Studies; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D016896:Treatment Outcome