Figure 1From: The bioavailability and airway clearance of the steroid component of budesonide/formoterol and salmeterol/fluticasone after inhaled administration in patients with COPD and healthy subjects: a randomized controlled trial Crossover study design. BUD/FORM = budesonide/formoterol; SAL/FLU = salmeterol/fluticasone; R = randomization.Back to article page