1. Respiratory Disease Unit, Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, Padova, Italy
2. National Heart and Lung Institute, Imperial College, London, UK
3. Interstitial Lung Disease Unit, Royal Brompton and Harefield Hospitals, London, UK
4. Hastings Centre for Pulmonary Research and Division of Pulmonary, Critical Care and Sleep Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA