| http://www.w3.org/ns/prov#value | - an implantable endoprosthesis having a tubular and radially expandable structure adapted to be disposed in a body lumen; and at least one elongate marker removably attached to the implantable endoprosthesis, the marker including a radiopaque material having a linear attenuation coefficient of from about 10 cm???1 at 50 KeV to about 120 cm???1 at 50 KeV, a proximal end, a distal end, and a thicknes
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