No abstract available
MeSH terms
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Adult
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Aged
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Betacoronavirus
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COVID-19
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China / epidemiology
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Coronavirus Infections / epidemiology*
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Cross Infection / epidemiology*
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Female
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Humans
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Male
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Middle Aged
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Pandemics
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Pneumonia, Viral / epidemiology*
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Retrospective Studies
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Risk Factors
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SARS-CoV-2