| http://www.w3.org/ns/prov#value | - However, in alternative embodiments, the expansion balloon 123 may comprise another shape, such as a concave shape (shaped somewhat like the stricture itself) having a greater degree of expansion at a distal end of the stricture 105 and at a proximal end of the stricture 105, and having a lesser degree of expansion at a middle portion of the stricture 105.
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