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HIV Infections
Substance-Related Disorders
Alcoholism
Heroin Dependence
Primary Health Care
CD4 Lymphocyte Count
Cohort Studies
Prospective Studies
Cross-Sectional Studies
Risk Factors
Treatment Outcome
Prevalence
Homeless Persons
Alcohol Drinking
Risk-Taking
Questionnaires
Sexual Behavior
Substance Abuse Treatment Centers
Boston
Massachusetts
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