RT Journal Article SR Electronic T1 From the authors JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 688 OP 689 DO 10.1183/09031936.00156607 VO 31 IS 3 A1 R. Pellegrino A1 G. Viegi A1 P. Levy A1 V. Brusasco YR 2008 UL http://erj.ersjournals.com/content/31/3/688.abstract AB