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Inhaled Long-Acting β-Agonists Versus Anticholinergics in Older Patients With Chronic Obstructive Pulmonary Disease
Matthew B. Stanbrook, MD, PhD; Andrea Gershon, MD, MSc
Annals of Internal Medicine 2011;155:561-562. doi:10.7326/0003-4819-155-8-201110180-00019

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