No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adolescent
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Adult
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Aged
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Aged, 80 and over
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Bisexuality*
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Cohort Studies
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England / epidemiology
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HIV Infections / epidemiology
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HIV Infections / transmission*
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Homosexuality*
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Humans
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Male
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Middle Aged
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Sexual Behavior
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Wales / epidemiology