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Risk-Taking
Intravenous Substance Abuse
Needle Sharing
Adolescent Behavior
Sexual Behavior
Alcohol Drinking
Needle-Exchange Programs
Substance-Related Disorders
HIV Infections
Hepatitis C
Chicago
United States
Longitudinal Studies
Prevalence
Cohort Studies
Logistic Models
Cross-Sectional Studies
Risk Factors
Peer Group
Homeless Youth
Co-Publications
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7
5
4
3
2
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