[1] APHP, Cochin Hosp Grp, Paris, France
[2] Univ Paris 05, Paris, France
[3] Grp Hosp Cochin, F-75005 Paris, France
[4] Univ Sydney, Woolcock Inst Med Res, Sydney, NSW 2006, Australia
[5] Univ Barcelona, Hosp Clin, IDIBAPS, Mallorca, Spain
[6] FISIB, CIBER Enfermedades Resp, Mallorca, Spain
[7] Univ Cape Town, Dept Med, Div Pulmonol, ZA-7925 Cape Town, South Africa
[8] Univ Illinois Hosp & Hlth Sci Syst, Populat Hlth Sci, Chicago, IL USA
[9] Natl Jewish Med & Res Ctr, Denver, CO USA
[10] Univ Ferrara, Res Ctr Asthma & COPD, I-44100 Ferrara, Italy
[11] Ctr Groningen, Dept Pulmonol, Groningen, Netherlands
[12] Univ Groningen, Groningen, Netherlands
[13] Univ Southampton, Southampton, Hants, England
[14] Ghent Univ Hosp, Dept Resp Med, Ghent, Belgium
[15] Univ Ghent, B-9000 Ghent, Belgium
[16] Brigham & Womens Hosp, Dept Med, Boston, MA 02115 USA
[17] Johns Hopkins Sch Med, Baltimore, MD USA
[18] Resp Effectiveness Grp, Cambridge, England
[19] Univ Aberdeen, Ctr Acad Primary Care, Aberdeen, Scotland