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Intravenous Substance Abuse
Risk-Taking
Sexual Behavior
Male Homosexuality
Prostitution
Unsafe Sex
Needle Sharing
Questionnaires
HIV Infections
Substance-Related Disorders
Hepatitis C
Mexico
Baltimore
Risk Factors
Cohort Studies
Logistic Models
Cross-Sectional Studies
Prevalence
Needle-Exchange Programs
HIV Seropositivity
Co-Publications
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