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Pregnancy
Gestational Age
Pregnancy, Multiple
Retrospective Studies
Cohort Studies
Pregnancy Outcomes
Risk Factors
Maternal Age
Odds Ratio
Parity
Infant Mortality
Birth Order
Caesarean Section
Newborn Infant
Twins
United States
Saskatchewan
Pregnancy Induced Hypertension
Premature Birth
Pregnancy Complications
Co-Publications
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19
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16
10
6
5
4
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