Assertion: mechanical prosthesis | /r/HasProperty | ba bioprosthetic xenograft
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Source sentences:
text: It is recommended to determine whether (a) a mechanical prosthesis, (b) a bioprosthetic xenograft, stented or unstented, (c) an allograft, (d) a homograft, or (e) a repaired native valve with or without implantation of an annular ring is involved.8