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Comparison of Inhaled Long-Acting β-Agonist and Anticholinergic Effectiveness in Older Patients With Chronic Obstructive Pulmonary Disease: A Cohort Study
Andrea Gershon, MD, MSc; Ruth Croxford, MSc, PStat; Teresa To, PhD; Matthew B. Stanbrook, MD, PhD; Ross Upshur, MD, MSc; Paula Sanchez-Romeu, BMath, MMath; Thérèse Stukel, PhD
Annals of Internal Medicine 2011;154:583-592.
doi:10.7326/0003-4819-154-9-201105030-00003
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