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Substance-Related Disorders
Alcoholism
Diseases in Twins
HIV Infections
Acquired Immunodeficiency Syndrome
Social Environment
Risk Factors
Environment
Psychiatric Status Rating Scales
Comorbidity
Dizygotic Twins
Monozygotic Twins
Smoking
Intravenous Substance Abuse
Adoption
Sexual Behavior
Family
United States
Street Drugs
Nicotine
Co-Publications
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