Chung K F, 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 S T, Ind P, Joos G, Kerstjens H, Leuenberger P, Lofdahl C G, McKenzie S, Magnussen H, Postma D, Saetta M, Salmeron S, Sterk P
National Heart & Lung Institute, Imperial College School of Medicine, London, UK.
Eur Respir J. 1999 May;13(5):1198-208. doi: 10.1034/j.1399-3003.1999.13e43.x.