[1] Univ Autonoma Madrid, Hosp Univ La Princesa, Pulmonol Dept, Madrid, Spain
[2] Univ Hosp Essen, Ctr Interstitial & Rare Lung Dis, Pneumol Dept, Ruhrlandklin, Essen, Germany
[3] Erasmus MC, Dept Pulm Dis, Rotterdam, Netherlands
[4] Boehringer Ingelheim Int GmbH, Ingelheim, Germany
[5] Mainanalyt GmbH, Sulzbach, Germany
[6] Univ Southern Calif, Keck Sch Med, Los Angeles, CA USA
[7] Imperial Coll London, London, England