title: Strut separations in Björk-Shiley mitral valves.
mesh_terms: D006350:Heart Valve Prosthesis / Q000401:mortality; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging / Q000601:surgery; D011475:Prosthesis Failure; D011859:Radiography; D012680:Sensitivity and Specificity