RT Journal Article SR Electronic T1 Bronchodilator responsiveness in patients with COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00129607 A1 D.P. Tashkin A1 B. Celli A1 M. Decramer A1 D. Liu A1 D. Burkhart A1 C. Cassino A1 S. Kesten YR 2008 UL http://erj.ersjournals.com/content/early/2008/02/06/09031936.00129607.abstract AB