RT Journal Article SR Electronic T1 Activity limitation: a major consequence of dyspnoea in COPD JF European Respiratory Review JO EUROPEAN RESPIRATORY REVIEW FD European Respiratory Society SP 54 OP 57 DO 10.1183/09059180.00001309 VO 18 IS 112 A1 N. Roche YR 2009 UL http://err.ersjournals.com/content/18/112/54.abstract AB