RT Journal Article SR Electronic T1 Introduction JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 4 OP 4 DO 10.1183/09041950.004s1693 VO 6 IS Suppl 16 A1 Philip H. Quanjer YR 1993 UL http://erj.ersjournals.com/content/6/Suppl_16/4.abstract AB