RT Journal Article SR Electronic T1 From the authors: JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 223 OP 224 DO 10.1183/09031936.00143910 VO 37 IS 1 A1 S. Aaron A1 V. Luks YR 2011 UL http://erj.ersjournals.com/content/37/1/223.abstract AB