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Inhaled Long-Acting β-Agonists Versus Anticholinergics in Older Patients With Chronic Obstructive Pulmonary Disease
Leonardo M. Fabbri, MD; Claus Vogelmeier, MD; Klaus F. Rabe, MD
Annals of Internal Medicine 2011;155:561.
doi:10.7326/0003-4819-155-8-201110180-00018
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