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Sexually Transmitted Diseases
HIV Infections
Chlamydia Infections
Sexual Behavior
Risk-Taking
Adolescent Behavior
Health Knowledge, Attitudes, Practice
Condoms
Health Behavior
Questionnaires
Military Personnel
Chlamydia trachomatis
African Americans
Sexual Partners
Risk Factors
Urban Population
Cross-Sectional Studies
United States
San Francisco
Mass Screening
Co-Publications
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