No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Child
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Child, Preschool
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Humans
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Infant
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Influenza A Virus, H1N1 Subtype / immunology*
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Influenza Vaccines / immunology
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Influenza Vaccines / standards*
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Influenza, Human / epidemiology*
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Influenza, Human / prevention & control
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Japan
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Vaccination / statistics & numerical data*