
Improvements with tiotropium in COPD patients with concomitant asthma
Keywords: Chronic obstructive lung disease; Asthma; Tiotropium; Bronchodilators; SpirometryATS, American Thoracic Society; AUC, area under the curve; COPD, chronic obstructive pulmonary disease; ERS, European Respiratory Society; FVC, forced vital capacity; FEV1, f