[1] Univ Hosp Leuven, Dept Pulm Med, Unit Interstitial Lung Dis, Leuven, Belgium
[2] Univ Southern Calif, Keck Sch Med, Los Angeles, CA USA
[3] Univ Med Ctr, Dept Resp Med, Erasmus MC, Rotterdam, Netherlands
[4] Fachkrankenhaus Coswig, Coswig, Germany
[5] Weill Cornell Med, New York, NY USA
[6] Boehringer Ingelheim GmbH & Co KG, Ingelheim, Germany
[7] Boehringer Ingelheim Int GmbH, Ingelheim, Germany
[8] Univ Cattolica Sacro Cuore, Fdn Policlin Gemelli IRCCS, Rome, Italy