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LONG-TERM EVALUATION OF THE PORCINE XENOGRAFT BIOPROSTHESISJOURNAL OF THORACIC AND CARDIOVASCULAR SURGERYOyer, P. E., Stinson, E. B., Reitz, B. A., Miller, D. C., Rossiter, S. J., Shumway, N. E.1979; 78 (3): 343-350