No abstract available
MeSH terms
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Humans
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Poland / epidemiology
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Pulmonary Disease, Chronic Obstructive / diagnosis*
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Pulmonary Disease, Chronic Obstructive / epidemiology
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Pulmonary Disease, Chronic Obstructive / etiology
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Pulmonary Disease, Chronic Obstructive / therapy*
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Risk Factors
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Smoking / adverse effects
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Smoking / epidemiology
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Smoking Cessation
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Time Factors