ABSTRACT
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.REFERENCES
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Make B, Hanania NA, ZuWallack R, Kalberg C, Emmett A, et al. The efficacy and safety of inhaled fluticasone propionate/salmeterol and ipratropium/albuterol for the treatment of chronic obstructive pulmonary disease: an eight-week, multicenter, randomized, double-blind, double-dummy, parallel-group study. Clin Ther 2005; 27: 531-542.