| http://www.w3.org/ns/prov#value | - The elements 28, 30 and 32 can be made from any of the materials disclosed above for the leader 26 as well as collagen, glass, polylactic acid (PLA), poly(lactic-co-glycolic acid) (PLGA), polyglycolic acid (PGA), other bioabsorbable material, polyurethane, polyethylene, or metal, for example stainless steel, titanium or nitinol.
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