Tiotropium in Combination with Placebo, Salmeterol, or Fluticasone Salmeterol for Treatment of Chronic Obstructive Pulmonary Disease: A Randomized Trial -- Aaron et al. 146 (8): 545 Figure 1 -- Annals of Internal Medicine

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Figure 1. Study flow diagram.

COPD = chronic obstructive pulmonary disease.

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