Original Research

Impairment of small airways in COPD patients with frequent exacerbations and effects of treatment with tiotropium

Cristoforo Incorvaia, Gian Galeazzo Riario-Sforza, Chiara Pravettoni, Mona-Rita Yacoub, Franco Frati

International Journal of Chronic Obstructive Pulmonary Disease 2008, 3:123-126

Published Date: 7 March 2008