No abstract available
MeSH terms
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Adolescent
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Antibodies, Viral / blood
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Bias
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Child
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China / epidemiology
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Humans
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Incidence
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Influenza A Virus, H1N1 Subtype* / immunology
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Influenza Vaccines*
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Influenza, Human / diagnosis
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Influenza, Human / epidemiology
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Influenza, Human / prevention & control*
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Pandemics
Substances
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Antibodies, Viral
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Influenza Vaccines