RT Journal Article SR Electronic T1 Monitoring airway inflammation in asthma by induced sputum JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 5 OP 7 DO 10.1183/09031936.99.13100599 VO 13 IS 1 A1 H Magnussen A1 O Holz YR 1999 UL http://erj.ersjournals.com/content/13/1/5.abstract AB