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Pregnancy
Pregnancy, Multiple
Gestational Age
Newborn Infant
Triplets
African Americans
Twins
Retrospective Studies
Pregnancy Outcomes
Infant Mortality
Cohort Studies
Risk Factors
Maternal Age
Cross-Sectional Studies
Odds Ratio
United States
Nigeria
Smoking
HIV Infections
Pregnancy Complications
Co-Publications
37
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13
8
7
6
4
3
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