| http://www.w3.org/ns/prov#value | - Sealants which may be utilized to adhere the upper and lower layers 104 a, 104 b of the middle ring are known to those skilled in the art and include, but are not limited to, hydrogels, fibrin-based sealants, thrombin-based sealants, collagen-based sealants, and synthetic polymer sealants including those based on polyalkylene oxides such as polyethylene glycol, polydioxanones, polylactides, polygl
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