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Aged
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Article
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Female
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Humans
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Middle Aged
Retrospective Studies
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aged
economics
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female
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human
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male
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medicare
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middle aged
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observational study
retrospective study
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Aged, 80 and over
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Muscarinic Antagonists
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Patient Acceptance of Health Care
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Pulmonary Disease, Chronic Obstructive
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antibiotic agent
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beta 2 adrenergic receptor stimulating agent
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chronic obstructive lung disease
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cohort analysis
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comparative study
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corticosteroid
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disease exacerbation
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emergency ward
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follow up
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health care cost
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