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HIV Infections
Acquired Immunodeficiency Syndrome
Cohort Studies
Risk Factors
Cross-Sectional Studies
Multivariate Analysis
Time Factors
Logistic Models
Prospective Studies
Retrospective Studies
Proportional Hazards Models
Incidence
Magnetic Resonance Imaging
Survival Analysis
San Francisco
United States
HIV Seropositivity
HIV-1
Homosexuality
CD4 Lymphocyte Count
Co-Publications
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