No abstract available
MeSH terms
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Adolescent
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Adult
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Communicable Diseases, Emerging / epidemiology*
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Disease Outbreaks / statistics & numerical data*
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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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Middle Aged
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Population Surveillance
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Portugal / epidemiology
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Risk Assessment / methods*
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Risk Factors
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Rural Population / statistics & numerical data*
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Syphilis / epidemiology*
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Urban Population / statistics & numerical data*