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Our data says that the document:

Douglas , Mapel ; Melissa , Roberts. (2012) New Clinical Insights into Chronic Obstructive Pulmonary Disease and Their Implications for Pharmacoeconomic Analyses.
In: PharmacoEconomics. RePEc:spr:pharme:v:30:y:2012:i:10:p:869-885.

Full description at Econpapers

cites:

Aaron SD, Vandemheen KL, Fergusson D, et al. Tiotropium in combination with placebo, salmeterol, or fluticasone-salmeterol for treatment of chronic obstructive pulmonary disease: a randomized trial. Ann Intern Med 2007 Apr 17; 146 (8): 545–55.

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