[1] Univ Marburg, German Ctr Lung Res DZL, Marburg, Germany
[2] Temple Univ, Lewis Katz Sch Med, Philadelphia, PA 19122 USA
[3] New York Presbyterian Hosp, Weill Cornell Med Ctr, New York, NY 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] Imperial Coll, Natl Heart & Lung Inst, London, England
[7] McGill Univ, Ctr Hlth, Montreal, PQ, Canada
[8] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[9] Guangzhou Med Univ, Affiliated Hosp 1, Guangzhou Inst Resp Dis, State Key Lab Resp Dis, Guangzhou, Guangdong, Peoples R China
[10] Univ Leuven, Leuven, Belgium
[11] Univ Modena & Reggio Emilia, Modena, Italy
[12] Flinders Univ S Australia, Fac Med, Bedford Pk, SA, Australia
[13] Royal Devon & Exeter Hosp, Exeter, Devon, England
[14] Univ Republica, Hosp Maciel, Montevideo, Uruguay
[15] Hokkaido Univ, Sch Med, Sapporo, Hokkaido, Japan
[16] Univ Paris 05, Hop Cochin, AP HP, Paris, France
[17] Univ Barcelona, Hosp Clin, Thorax Inst, Barcelona, Spain
[18] Univ British Columbia, St Pauls Hosp, Vancouver, BC, Canada
[19] Univ Manchester, Manchester, Lancs, England
[20] Univ Hosp, Birmingham, W Midlands, England
[21] Univ Barcelona, Hosp Clin, Ctr Invest Biomed Red Enfermedade Resp, Barcelona, Spain