%0 Journal Article %A KF Chung %A P Godard %A E Adelroth %A J Ayres %A N Barnes %A P Barnes %A E Bel %A P Burney %A P Chanez %A G Connett %A C Corrigan %A J de Blic %A L Fabbri %A ST Holgate %A P Ind %A G Joos %A H Kerstjens %A P Leuenberger %A CG Lofdahl %A S McKenzie %A H Magnussen %A D Postma %A M Saetta %A S Salmeron %A P Sterk %T Difficult/therapy-resistant asthma: the need for an integrated approach to define clinical phenotypes, evaluate risk factors, understand pathophysiology and find novel therapies. ERS Task Force on Difficult/Therapy-Resistant Asthma. European Respiratory Society %D 1999 %R 10.1034/j.1399-3003.1999.13e43.x %J European Respiratory Journal %P 1198-1208 %V 13 %N 5 %U https://erj.ersjournals.com/content/erj/13/5/1198.full.pdf