No abstract available
Publication types
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Comment
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Comparative Study
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Letter
MeSH terms
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Age Factors
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Aged
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Aged, 80 and over
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Aging / physiology*
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Bronchoalveolar Lavage Fluid / cytology*
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CD4-CD8 Ratio
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Female
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Humans
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Lymphocytes / immunology
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Male
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Middle Aged
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Probability
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Pulmonary Disease, Chronic Obstructive / physiopathology
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Reference Values
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Risk Factors
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Sampling Studies
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Sputum / cytology*
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Sputum / immunology