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Brazil
Intravenous Substance Abuse
Needle Sharing
Health Knowledge, Attitudes, Practice
Risk-Taking
Sexual Behavior
Socioeconomic Factors
Risk Factors
Cross-Sectional Studies
Cohort Studies
Sex Distribution
Urban Health
Needle-Exchange Programs
HIV Infections
Hepatitis C
Epidemiologic Methods
Case Control Studies
CD4 Lymphocyte Count
HIV Seropositivity
Infants
Co-Publications
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