No abstract available
MeSH terms
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Erectile Dysfunction / drug therapy*
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Erectile Dysfunction / etiology
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Humans
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Male
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Penile Erection / physiology*
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Piperazines / therapeutic use*
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Placebos
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Purines / therapeutic use
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Reflex
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Sildenafil Citrate
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Spinal Cord Injuries / complications*
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Sulfones / therapeutic use*
Substances
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Piperazines
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Placebos
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Purines
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Sulfones
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Sildenafil Citrate