[1] Univ Calgary, Dept Med, Calgary, AB, Canada
[2] Univ Med & Pharm Carol Davila, Pulmonol Dept, Bucharest, Romania
[3] GB Morgagni L Pierantoni Hosp, Dept Thorac Dis, Pulmonol Unit, Forli, Italy
[4] St Antonius Hosp, Dept Pulmonol, Interstitial Lung Dis Ctr Excellence, Nieuwegein, Netherlands
[5] Univ Med Ctr Utrecht, Div Heart & Lungs, Utrecht, Netherlands
[6] Hosp Univ Princesa, Pulmonol Dept, Madrid, Spain
[7] Univ Ege, Pulmonol Dept, Bornova, Turkey
[8] Univ Hosp Modena, Ctr Rare Lung Dis, Modena, Italy
[9] Univ Cattolica Sacro Cuore, UOC Pneumol, Rome, Italy
[10] Royal Brompton Hosp, Interstitial Lung Dis Unit, London SW3 6NP, England
[11] Univ Catania, Dept Clin & Expt Med, Reg Referral Ctr Rare Lung Dis, Catania, Sicily, Italy
[12] Heidelberg Univ, Thoraxklin, Ctr Interstitial & Rare Lung Dis, Pneumol & Resp Crit Care Med, Heidelberg, Germany
[13] German Ctr Lung Res, Translat Lung Res Ctr Heidelberg, Heidelberg, Germany