No abstract available
MeSH terms
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Female
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Health Education / methods*
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Health Education / trends
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Humans
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Lung / physiology*
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Lung Diseases, Obstructive / epidemiology
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Lung Diseases, Obstructive / physiopathology
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Lung Diseases, Obstructive / prevention & control*
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Male
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Morbidity / trends
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Physician-Patient Relations
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Pulmonary Medicine / methods*
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Pulmonary Medicine / standards
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Pulmonary Medicine / trends
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Social Class
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Survival Rate / trends
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United States / epidemiology