No abstract available
MeSH terms
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Africa
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Asia
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Contraceptives, Oral
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Ecology
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Emigration and Immigration
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Europe
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Female
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Homosexuality
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Humans
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Male
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North America
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Population Control
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Sex Work
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Sexual Behavior
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Socioeconomic Factors
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South America
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Syphilis / epidemiology*
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Syphilis / prevention & control
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Syphilis Serodiagnosis
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Transients and Migrants
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USSR
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United Kingdom
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Warfare