No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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China / epidemiology
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Cohort Studies
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HIV Infections / epidemiology*
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HIV Infections / transmission
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Homosexuality, Male*
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Humans
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Incidence
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Male
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Prospective Studies
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Syphilis / epidemiology*
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Syphilis / transmission
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Time Factors
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Urban Population
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Young Adult