1. Department of Respiratory Medicine, Erasmus MC, University Medical Centre, Rotterdam, The Netherlands;
2. Center for Interstitial and Rare Lung Diseases, Pneumology, Thoraxklinik, University of Heidelberg, Member of the German Center for Lung Research, Heidelberg, Germany;
3. National Jewish Health, Denver, CO, USA;
4. University of Colorado School of Medicine, Denver, CO, USA;
5. Department of Respiratory Diseases and Allergy, Aarhus University Hospital, Aarhus, Denmark;
6. Decision Resources Group, Burlington, MA, USA;
7. Centre for Rheumatology and Connective Tissue Diseases, University College London Division of Medicine, London, UK;
8. Boehringer Ingelheim International GmbH, Ingelheim am Rhein, Germany;
9. Reference Center for Rare Pulmonary Diseases, Louis Pradel Hospital, Claude Bernard University Lyon 1, Lyon, France