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Intravenous Substance Abuse
Risk-Taking
HIV Infections
Acquired Immunodeficiency Syndrome
Substance-Related Disorders
New York City
Baltimore
United States
Risk Factors
Cohort Studies
Prospective Studies
Prevalence
Cross-Sectional Studies
Logistic Models
Incidence
HIV Seropositivity
HIV-1
CD4 Lymphocyte Count
Needle-Exchange Programs
Disease Progression
Co-Publications
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