Tiotropium in Combination with Placebo, Salmeterol, or Fluticasone–Salmeterol for Treatment of Chronic Obstructive Pulmonary Disease

Figure 1.
Figure 1. Study flow diagram.

COPD = chronic obstructive pulmonary disease.

This Article

  1. Published online before print February 19, 2007, Ann Intern Med April 17, 2007 vol. 146 no. 8 545-555
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