No abstract available
Publication types
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Editorial
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Research Support, U.S. Gov't, P.H.S.
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Review
MeSH terms
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Case-Control Studies
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Cross-Sectional Studies
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Data Collection
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HIV Seropositivity / transmission*
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Humans
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Needle-Exchange Programs*
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Prospective Studies
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Risk Assessment
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Risk-Taking
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Substance Abuse, Intravenous*