title: Long-term evaluation of the porcine xenograft bioprosthesis.
mesh_terms: D001021:Aortic Valve / Q000601:surgery; D001161:Arteriosclerosis / Q000150:complications; D005500:Follow-Up Studies; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis / Q000401:mortality*; D006801:Humans; D008943:Mitral Valve / Q000601:surgery; D011183:Postoperative Complications; D014183:Transplantation, Heterologous