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HIV Infections
Vertical Infectious Disease Transmission
AIDS-Related Opportunistic Infections
Infants
HIV-1
Newborn Infant
Highly Active Antiretroviral Therapy
CD4 Lymphocyte Count
Retrospective Studies
Cohort Studies
Viral Load
Confidence Intervals
Risk Factors
Odds Ratio
Anti-HIV Agents
Zidovudine
Philadelphia
United States
CD4-Positive T-Lymphocytes
Pregnancy
Co-Publications
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7
6
4
3
2
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