RT Journal Article SR Electronic T1 From the authors JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 452 OP 453 DO 10.1183/09031936.00171408 VO 33 IS 2 A1 D. Stolz A1 M. Tamm YR 2009 UL http://erj.ersjournals.com/content/33/2/452.abstract AB