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Intravenous Substance Abuse
Risk-Taking
Needle Sharing
Questionnaires
Prostitution
Sexual Behavior
British Columbia
Canada
HIV Infections
Cocaine-Related Disorders
Heroin Dependence
Hepatitis C
Cohort Studies
Prospective Studies
Risk Factors
Prevalence
Incidence
Logistic Models
Needle-Exchange Programs
Street Drugs
Co-Publications
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