No abstract available
MeSH terms
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Birth Weight
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Black People
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Blood
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Blood Specimen Collection
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Diet
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Female
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Fetus / metabolism*
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Gestational Age
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Humans
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Infant, Newborn
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Infant, Premature*
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Maternal-Fetal Exchange*
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Pregnancy
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Racial Groups
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Regression Analysis
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Seasons
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Statistics as Topic
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Twins
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Umbilical Cord
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Vitamin D / blood
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Vitamin D / metabolism*
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Vitamins / therapeutic use