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Male Homosexuality
Risk-Taking
Sexual Behavior
Unsafe Sex
Condoms
Questionnaires
Health Knowledge, Attitudes, Practice
HIV Infections
Substance-Related Disorders
New York City
United States
AIDS Vaccines
Sexual Partners
HIV-1
Young Adult
Risk Factors
Cross-Sectional Studies
Prevalence
Cohort Studies
HIV Seropositivity
Co-Publications
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14
13
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