[1] Univ Paris 05, Resp Med, Paris, France
[2] EFFI STAT, Biostat, Paris, France
[3] Univ London Imperial Coll Sci Technol & Med, Charing Cross Hosp, NHLI Div, London, England
[4] Hosp Clin Barcelona, Ciber Enfermedades Resp CIBERES, IDIBAPS, Fundacio Clin, Barcelona, Spain
[5] Univ Roma Tor Vergata, Dept Syst Med, Pulm Pharmacol & Therapeut, Rome, Italy
[6] Univ Marburg, Div Pulm Dis, Marburg, Germany
[7] AstraZeneca, Dept Med, Rueil Malmaison, France
[8] Nouvel Hop Civil, Dept Pneumol, Strasbourg, France