No abstract available
MeSH terms
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Black or African American*
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Breast Feeding / adverse effects*
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Child, Preschool
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Culture
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Humans
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Infant
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Nutritional Requirements
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Rickets / epidemiology
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Rickets / etiology*
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Sunlight*
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United States / epidemiology
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Vitamin D Deficiency / complications
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Vitamin D Deficiency / etiology*