1. Department of Respiratory Medicine, First Faculty of Medicine of Charles University, Thomayer Hospital Prague, Prague, Czech Republic
2. Instituto Nacional de Enfermedades Respiratorias “Ismael Cosío Villegas,” Mexico City, Mexico
3. Vall d’Hebron Institut de Recerca, Servei de Pneumologiía, Hospital Universitari Vall d’Hebron, Barcelona, Spain
4. Department de Medicina UAB, Consorcio Centro de Investigación Biomédica en Red (CIBER) de Enfermedades Respiratoria, Barcelona, Spain
5. Hospital Universitario de Bellvitge, Instituto de Investigaciones Biomédicas de Bellvitge, Universidad de Barcelona, Hospitalet de Llobregat, Barcelona, Spain
6. CIBER de Enfermedades Respiratorias, Barcelona, Spain; and
7. Center for Interstitial Lung Diseases, University of Washington Medical Center, Seattle, Washington