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Alcoholism
HIV Infections
Substance-Related Disorders
Prospective Studies
Longitudinal Studies
Cohort Studies
Treatment Outcome
Socioeconomic Factors
Risk Factors
Homeless Persons
Alcohol Drinking
Smoking
Risk-Taking
Unsafe Sex
Massachusetts
Restaurants
Substance Abuse Treatment Centers
Tobacco Smoke Pollution
CD4 Lymphocyte Count
Primary Health Care
Co-Publications
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