| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein the at least one solution is a solution of a biocompatible polymer and a biocompatible solvent and wherein the forming step includes the step of precipitating the biocompatible polymer from the solution so that the biocompatible polymer solidifies in the wall and the biocompatible solvent disperses in the body.
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