No abstract available
MeSH terms
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Ascorbic Acid / therapeutic use*
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Child, Preschool
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Drug Therapy, Combination
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Echinacea*
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Evidence-Based Medicine
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Humans
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Infant
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Phytotherapy*
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Plant Preparations / therapeutic use*
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Plants, Medicinal*
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Propolis / therapeutic use*
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Randomized Controlled Trials as Topic
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Respiratory Tract Infections / prevention & control*
Substances
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Plant Preparations
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Propolis
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Ascorbic Acid