No abstract available
MeSH terms
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Adult
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Aged
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Erectile Dysfunction / drug therapy*
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Erectile Dysfunction / epidemiology
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Erectile Dysfunction / therapy
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Humans
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Male
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Middle Aged
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Phosphodiesterase Inhibitors / adverse effects
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Phosphodiesterase Inhibitors / economics
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Phosphodiesterase Inhibitors / therapeutic use*
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Piperazines / adverse effects
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Piperazines / economics
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Piperazines / therapeutic use*
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Psychotherapy / economics
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Purines
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Sildenafil Citrate
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Sulfones
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United States / epidemiology
Substances
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Phosphodiesterase Inhibitors
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Piperazines
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Purines
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Sulfones
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Sildenafil Citrate