[1] Natl Jewish Hlth, Pulm Crit Care & Sleep Med, Denver, CO USA
[2] Imperial Coll, Natl Heart & Lung Inst, London, England
[3] Royal Brompton & Harefield NHS Fdn Trust, Dept Radiol, London, England
[4] Univ Ulsan, Asan Med Ctr, Pulm & Crit Care Med, Coll Med, Seoul, South Korea
[5] Univ Hosp Leuven, Dept Resp Med, Unit Interstitial Lung Dis, Leuven, Belgium
[6] Hosp Univ La Princesa, Madrid, Spain
[7] Boehringer Ingelheim Pharma GmbH & Co KG, Biberach, Germany
[8] Boehringer Ingelheim Int GmbH, Ingelheim, Germany
[9] Boehringer Ingelheim Pharmaceut Inc, 90 E Ridge POB 368, Ridgefield, CT 06877 USA
[10] Royal Brompton & Harefield NHS Fdn, Natl Inst Hlth Res Resp Biomed Res Unit, London, England