No abstract available
MeSH terms
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Aged
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Aged, 80 and over
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Case-Control Studies
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Community-Acquired Infections / epidemiology
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Community-Acquired Infections / prevention & control
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Confounding Factors, Epidemiologic
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Female
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Geriatrics
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Humans
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Influenza Vaccines
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Male
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Medical Records
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Pneumonia / epidemiology
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Pneumonia / prevention & control*
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United States / epidemiology