RT Journal Article SR Electronic T1 Lifting the smokescreen JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 871 OP 873 DO 10.1183/09031936.06.00037706 VO 27 IS 5 A1 J. Britton A1 F. Godfrey YR 2006 UL http://erj.ersjournals.com/content/27/5/871.abstract AB