RT Journal Article SR Electronic T1 Airway mucosal inflammation in COPD is similar in smokers and ex-smokers: a pooled analysis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00013006 A1 E. Gamble A1 D.C. Grootendorst A1 K. Hattotuwa A1 T. O'Shaughnessy A1 F.S.F. Ram A1 Y. Qiu A1 J. Zhu A1 A.M. Vignola A1 C. Kroegel A1 F. Morell A1 I.D. Pavord A1 K.F. Rabe A1 P.K. Jeffery A1 N.C. Barnes YR 2007 UL http://erj.ersjournals.com/content/early/2007/05/15/09031936.00013006.abstract AB