title: [Early and midterm results of valve replacement with the Björk-Shiley convexo-concave valve].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001021:Aortic Valve / Q000601:surgery; D005069:Evaluation Studies as Topic; D005260:Female; D006350:Heart Valve Prosthesis / Q000592:standards; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery; D011184:Postoperative Period