No abstract available
Publication types
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Letter
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Aged
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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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Oxygen Inhalation Therapy* / statistics & numerical data
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Prevalence
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Pulmonary Disease, Chronic Obstructive* / epidemiology
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Pulmonary Disease, Chronic Obstructive* / therapy
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Self Report*
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United States / epidemiology