1. Department of Experimental and Clinical Medicine, Division of Internal Medicine, AOUC, University of Florence , Firenze, Italy
2. Department of Life Health and Environmental Sciences, Internal Medicine and Nephrology Division, ASL1 Avezzano-Sulmona-L'Aquila, University of L’Aquila , L'Aquila, Italy
3. Pulmonology Unit, Department of Medical Surgical and Health Sciences, University Hospital of Cattinara, University of Trieste , Trieste, Italy
4. FESCA (Federation of European Scleroderma Associations) Belgium, GILS (Gruppo Italiano, Lotta alla Sclerodermia (Italy) , Milan, Italy
5. Department of Rheumatology, Salford Care Organisation, Northern Care Alliance NHS Foundation Trust , Salford, UK
6. Division of Musculoskeletal and Dermatological Sciences, The University of Manchester , Manchester, UK
7. Division of Rheumatology, Department of Medicine, Johns Hopkins University , Baltimore, MD, USA