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Intravenous Substance Abuse
Risk-Taking
Sexual Behavior
Needle Sharing
Questionnaires
New York City
Logistic Models
Risk Factors
Interviews as Topic
Ethnic Groups
Age Factors
Cohort Studies
HIV Infections
Substance-Related Disorders
Hepatitis C
Drug Users
African Americans
Syringes
Street Drugs
Needle-Exchange Programs
Co-Publications
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