No abstract available
MeSH terms
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Hospitalization / statistics & numerical data
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Humans
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Influenza A Virus, H1N1 Subtype / pathogenicity*
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Influenza A Virus, H3N2 Subtype / pathogenicity*
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Influenza, Human / complications*
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Influenza, Human / epidemiology
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Pandemics*
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Severity of Illness Index
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United States / epidemiology