[1] Univ Duisburg Essen, Zentrum Interstitielle & Seltene Lungenkrankheite, Klin Pneumol,Univ Med Essen, Ruhrlandklin,Univ Klinikum,Westdeutsch Lungenzent, Duisburg, Germany
[2] Mayo Clin Rochester, Div Pulm & Crit Care Med, Rochester, MN USA
[3] Kurume Univ, Sch Med, Div Respirol Neurol & Rheumatol, Dept Internal Med, Kurume, Fukuoka, Japan
[4] Careggi Univ Hosp, Dept Expt & Clin Med, Florence, Italy
[5] Univ Autonoma Madrid, Hosp Univ Princesa, Madrid, Spain
[6] Univ Hosp Leuven, Dept Pulm Med, Unit Interstitial Lung Dis, Leuven, Belgium
[7] Mainanalyt GmbH, Sulzbach, Germany
[8] Boehringer Ingelheim Int GmbH, Ingelheim, Germany
[9] Aarhus Univ Hosp, Dept Resp Dis & Allergy, Ctr Rare Lung Dis, Aarhus, Denmark