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EPIDEMIOLOGY OF TWINNING IN A POPULATION-BASED SAMPLE OF LIVE
BIRTHS, 1997-2007
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Predictors of Prenatal Care Among Case & Control Mothers in the National Birth Defects Prevention Study, 1997-2009
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Risk Factors for Isolated Total Anomalous Pulmonary Venous Return, National Birth Defects Prevention Study, 1997-2011
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