[1] S Manchester Univ Hosp NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Manchester, Lancs, England
[2] Odense Univ Hosp, DK-5000 Odense, Denmark
[3] Univ So Denmark, Odense, Denmark
[4] Global Initiat Chron Obstruct Lung Dis, Vancouver, WA USA
[5] Univ Barcelona, Hosp Clin, Barcelona, Spain
[6] St Georges Hosp Med Sch, London, England
[7] Univ Giessen, Marburg, Germany
[8] Marburg Sch Med, Marburg, Germany
[9] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[10] Natl Heart & Lung Inst, London, England
[11] Univ Modena & Reggio Emilia, Modena, Italy
[12] Univ Michigan, Sch Med, Ann Arbor, MI USA
[13] Hokkaido Univ, Sch Med, Sapporo, Hokkaido 060, Japan
[14] Univ Hosp Birmingham, Birmingham, W Midlands, England
[15] St Pauls Hosp, Vancouver, BC V6Z 1Y6, Canada