Pilot Study Comparing Tiotropium (Spiriva) to Salmeterol (Serevent) Plus Fluticasone (Flixotide) in Chronic Obstructive Pulmonary Disease (COPD) [clinicaltrials:NCT00239499]

Pilot Study Comparing Tiotropium (Spiriva) to Salmeterol (Serevent) Plus Fluticasone (Flixotide) in Chronic Obstructive Pulmonary Disease (COPD) [clinicaltrials:NCT00239499]