No abstract available
MeSH terms
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Cocaine
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Cohort Studies
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Comorbidity
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Cross-Sectional Studies
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HIV Infections / transmission
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HIV Seropositivity / epidemiology*
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Humans
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Injections, Intravenous / adverse effects
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Prospective Studies
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Research Design
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Risk Factors
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San Francisco / epidemiology
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Sexual Partners
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Substance Abuse, Intravenous / epidemiology*