| http://www.w3.org/ns/prov#value | - Additional biocompatible polymers which may be included in the matrix 16, individually or in a blend, comprise aliphatic polyesters including polyglycolide, poly(dl-lactide), poly(l-lactide), poly(??-valerolactone), polyhydroxybutyrate; polyanhydrides including poly[bis(p-carboxyphenoxy) propane anhydride], poly(carboxy phenoxyacetic acid), poly(carboxy pheoxyvaleric acid); polyphosphazenes includ
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