No abstract available
MeSH terms
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Bronchitis / metabolism
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Bronchopneumonia / metabolism
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Child
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Child, Preschool
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Feces / analysis
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Fluorometry
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Gastroenteritis / metabolism*
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Humans
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Intestinal Absorption*
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Respiratory Tract Infections / metabolism*
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Spectrophotometry
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Tritium
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Vitamin A / blood
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Vitamin A / metabolism*
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Vitamin A / urine
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Vitamin A Deficiency / etiology