No abstract available
MeSH terms
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Adult
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Coitus
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England / epidemiology
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HIV Infections / diagnosis
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HIV Infections / epidemiology
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Homosexuality, Male / statistics & numerical data*
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Humans
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Incidence
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Male
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Risk Factors
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Sexual Behavior
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Sexually Transmitted Diseases / classification
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Sexually Transmitted Diseases / epidemiology*
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Sexually Transmitted Diseases / etiology
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Wales / epidemiology