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Intravenous Substance Abuse
Risk-Taking
Sexual Behavior
Needle Sharing
Questionnaires
San Francisco
California
Needle-Exchange Programs
HIV Infections
Drug Overdose
Cross-Sectional Studies
Risk Factors
Multivariate Analysis
Logistic Models
Urban Health
Homeless Persons
Prevalence
Syringes
Crack Cocaine
Methamphetamine
Co-Publications
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24
11
10
9
8
5
4
3
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