title: Discussion.
mesh_terms: D001021:Aortic Valve / Q000000981:diagnostic imaging / Q000601:surgery*; D001024:Aortic Valve Stenosis / Q000175:diagnosis / Q000601:surgery*; D001705:Bioprosthesis; D004452:Echocardiography; D006350:Heart Valve Prosthesis; D006801:Humans; D011446:Prospective Studies; D011474:Prosthesis Design