No abstract available
Publication types
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Clinical Trial
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Aged
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Heart Failure / complications
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Heart Failure / drug therapy*
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Humans
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Hypertension, Pulmonary / drug therapy*
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Hypertension, Pulmonary / etiology
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Middle Aged
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Piperazines / therapeutic use*
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Purines / therapeutic use
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Sildenafil Citrate
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Sulfones / therapeutic use*
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Treatment Outcome
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Vasodilator Agents / therapeutic use*
Substances
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Piperazines
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Purines
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Sulfones
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Vasodilator Agents
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Sildenafil Citrate