RT Journal Article SR Electronic T1 From the Authors JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 330 OP 331 DO 10.1183/09031936.04.00043804 VO 24 IS 2 A1 G. Hanf A1 O. Noga YR 2004 UL http://erj.ersjournals.com/content/24/2/330.2.abstract AB