[Concentric stent-post creeping of porcine xenografts in mitral position].
D000328:Adult; D001705:Bioprosthesis; D006350:Heart Valve Prosthesis; D006801:Humans; D008875:Middle Aged; D008943:Mitral Valve / Q000601:surgery*; D011475:Prosthesis Failure; D013997:Time Factors