[1] Comprehens Pneumol Ctr, Dept Internal Med 5, Munich, Germany
[2] German Ctr Lung Res, Munich, Germany
[3] Inova Fairfax Hosp, Inova Heart & Vasc Inst, Falls Church, VA USA
[4] Univ Milan, Dept Clin Sci & Community Hlth, Milan, Italy
[5] Osped San Giuseppe, Dept Med, MultiMed IRCCS, Milan, Italy
[6] Univ Leuven, Dept Pulm Med, Unit Interstitial Lung Dis, Leuven, Belgium
[7] F Hoffmann La Roche Ltd, Basel, Switzerland
[8] Royal Brompton Hosp, Interstitial Lung Dis Unit, London, England