RT Journal Article SR Electronic T1 INTRODUCTION JF European Respiratory Review JO EUROPEAN RESPIRATORY REVIEW FD European Respiratory Society SP 43 OP 44 DO 10.1183/09059180.05.00009500 VO 14 IS 95 A1 L. P. Nicod YR 2005 UL http://err.ersjournals.com/content/14/95/43.abstract AB