[1] McMaster Univ, Hamilton, ON, Canada
[2] Imperial Coll, Natl Inst Hlth Res Resp Biomed Res Unit, Royal Brompton & Harefield NHS Fdn Trust, London, England
[3] Imperial Coll, Natl Heart & Lung Inst, London, England
[4] Univ Munich LMU, Med Klin & Poliklin 5, Munich, Germany
[5] Asklepios Klin Munchen Gauting, German Ctr Lung Res, Munich, Germany
[6] Univ Cattolica Sacro Cuore, Fdn Policlinico A Gemelli, Rome, Italy
[7] Boehringer Ingelheim Pharma GmbH & Co KG, Ingelheim, Germany
[8] Heidelberg Univ, Thoraxklin, Ctr Interstitial & Rare Lung Dis, Pneumol & Resp Care Med, Heidelberg, Germany
[9] Univ Washington, Seattle, WA 98195 USA
[10] Weill Cornell Med Coll, New York, NY USA