No abstract available
Keywords:
COPD; observational study; pharmacoepidemiology.
MeSH terms
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Humans
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Observational Studies as Topic / standards*
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Practice Guidelines as Topic*
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Pulmonary Disease, Chronic Obstructive* / diagnosis
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Pulmonary Disease, Chronic Obstructive* / drug therapy
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Pulmonary Disease, Chronic Obstructive* / epidemiology
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Pulmonary Disease, Chronic Obstructive* / etiology