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

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