1. Interstitial Lung Disease Unit Royal Brompton Hospital, National Heart and Lung Institute, Imperial College London UK
2. Oxford Centre for Respiratory Medicine Oxford University Hospitals Oxford UK
3. Division of Respiratory Medicine Lausanne University Hospital (CHUV) Lausanne Switzerland
4. Division of Pulmonary Rehabilitation Istituti Clinici Scientifici Maugeri, IRCCS Tradate Italy
5. Unita' Operativa Malattie Respiratorie Ospedale Guido Salvini Milan Italy
6. Respiratory Disease and Lung Function Unit, Department of Medicine and Surgery University of Parma Parma Italy
7. Centre for Rheumatology and Connective Tissue Diseases Royal Free and University College Medical School London UK
8. Department of Biochemistry Royal Brompton Hospital London UK
9. Department of Medicine, Surgery and Neuroscience University of Siena Siena Italy