[1] Imperial Coll London, Airways Dis Sect, Natl Heart & Lung Inst, London, England
[2] Univ Liverpool, Inst Ageing & Chron Dis, Liverpool, Merseyside, England
[3] Univ Colorado, Dept Med, Aurora, CO USA
[4] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[5] South Texas Vet Hlth Care Syst, San Antonio, TX USA
[6] Temple Univ, Dept Thorac Med & Surg, Lewis Katz Sch Med, Philadelphia, PA 19122 USA
[7] UCL, UCL Resp, London, England
[8] Hosp Univ Vall dHebron, Dept Pneumol, CIBERES, Barcelona, Spain
[9] Univ Ferrara, Dept Med Sci, Resp Med, Ferrara, Italy
[10] Univ Kiel, Dept Internal Med, Kiel, Germany
[11] German Ctr Lung Res, LungenClin Grosshansdorf, Airway Res Ctr North, Grosshansdorf, Germany
[12] Iberoamer Cochrane Ctr, Barcelona, Spain
[13] Inst TB & Lung Dis, Dept Resp Med 2, Warsaw, Poland
[14] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[15] Univ Manchester, Div Infect Immun & Resp Med, Manchester, Lancs, England
[16] Boston Univ, Sch Med, Dept Med, Boston, MA 02118 USA
[17] Univ Illinois Hosp & Hlth Sci Syst, Chicago, IL USA