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Puerto Rico
Intravenous Substance Abuse
Risk-Taking
Needle Sharing
Sexual Behavior
HIV Infections
Substance-Related Disorders
Socioeconomic Factors
Risk Factors
Longitudinal Studies
Prevalence
Urban Health
Urban Population
Multivariate Analysis
Logistic Models
Regression Analysis
Hispanic Americans
Counseling
HIV Seropositivity
Crack Cocaine
Co-Publications
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