title: Late thrombotic obstruction of aortic porcine bioprostheses.
mesh_terms: D000328:Adult; D001021:Aortic Valve; D001705:Bioprosthesis / Q000009:adverse effects*; D006350:Heart Valve Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology*; D013927:Thrombosis / Q000209:etiology*; D013997:Time Factors