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    <bibo:abstract>&lt;p&gt;Nonhealing skin ulceration is a cutaneous manifestation of the antiphospholipid syndrome (APS) and is associated with thrombosis of small dermal vessels. Numerous therapies have been described but are either ineffective or require a prolonged course of treatment with potential complications. We describe the efficacy of sildenafil, a phosphodiesterase inhibitor, in the treatments of such ulcers.&lt;p&gt;</bibo:abstract>
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