| http://www.w3.org/ns/prov#value | - For example, vertebral rod 20 can be fabricated from materials such as titanium, thermoplastics such as polyaryletherketone (PAEK) including PEEK and PEK, carbon-PEEK composites, PEEK-BaSO4 polymeric rubbers, biocompatible materials such as polymers including plastics, metals, ceramics and composites thereof, rigid polymers including polyphenylene, polyamide, polyimide, polyetherimide, polyethylen
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