RT Journal Article SR Electronic T1 From the authors JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 709 OP 709 DO 10.1183/09031936.04.00063904 VO 24 IS 4 A1 Willson, G.N. A1 Piper, A.J. A1 Grunstein, R.R. YR 2004 UL http://erj.ersjournals.com/content/24/4/709.1.abstract AB