Authors: Chung, KF Godard, P Adelroth, E Ayres, J Barnes, N Barnes, P Bel, E Burney, P Chanez, P Connett, G Corrigan, C de Blic, J Fabbri, L Holgate, ST Ind, P Joos, G Kerstjens, H Leuenberger, P Lofdahl, CG McKenzie, S Magnussen, H Postma, D Saetta, M Salmeron, S Silverman, M Sterk, P

Citation: Kf. Chung et al., Difficult/therapy-resistant asthma - The need for an integrated approach to define clinical phenotypes, evaluate risk factors, understand pathophysiology and find novel therapies, EUR RESP J, 13(5), 1999, pp. 1198-1208