No abstract available
MeSH terms
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Anus Diseases / epidemiology
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England
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Gonorrhea / epidemiology
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Homosexuality / complications*
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Humans
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London
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Male
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Penile Diseases / epidemiology
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Rectal Diseases / epidemiology
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Scotland
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Sexually Transmitted Diseases / epidemiology*
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Syphilis / epidemiology
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Wales