RT Journal Article SR Electronic T1 From the authors: JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 218 OP 219 DO 10.1183/09031936.00093810 VO 37 IS 1 A1 K. Ward YR 2011 UL http://erj.ersjournals.com/content/37/1/218.2.abstract AB