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.