No abstract available
Publication types
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Letter
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Child, Preschool
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Comorbidity
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Female
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Humans
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Male
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Respiratory Sounds / etiology*
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Risk Factors
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Virus Diseases / blood*
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Virus Diseases / epidemiology
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Vitamin D / analogs & derivatives*
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Vitamin D / blood
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Vitamin D Deficiency / blood
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Vitamin D Deficiency / complications*
Substances
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Vitamin D
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25-hydroxyvitamin D