No abstract available
MeSH terms
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Aged
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Aged, 80 and over
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DNA, Viral / genetics
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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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Prospective Studies
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Pulmonary Disease, Chronic Obstructive / complications*
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Pulmonary Disease, Chronic Obstructive / virology
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Respiratory Tract Infections / virology*
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Smoking / adverse effects*
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Virus Diseases / etiology*
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Viruses / genetics*