[1] Univ Florence, Dept Expt & Clin Med, Div Internal Med, Florence, Italy
[2] Univ Aquila, Dept Clin Med Life Hlth & Environm Sci, Internal Med & Nephrol Div, ASL1 Avezzano Sulmona, Laquila, Italy
[3] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, England
[4] Univ Trieste, Hosp Cattinara, Dept Med Surg & Hlth Sci, Pulmonol Unit, Trieste, Italy
[5] FESCA Federat European Scleroderma Assoc Belgium, Tournai, Belgium
[6] GILS Grp Italiano Lotta Sclerodermia, Milan, Italy
[7] Univ Florence, Dept Expt & Clin Med, Florence, Italy
[8] Ctr Hospitalar Univ Sao Joao, Dept Rheumatol, Porto, Portugal
[9] Sheffield Teaching Hosp NHS Fdn Trust, Sheffield, England
[10] Salford Royal, Dept Hand Surg, Salford, England
[11] Univ Florence, Dept Expt & Clin Med, Div Rheumatol, Florence, Italy
[12] Univ Texas Hlth Sci Ctr Houston, Dept Med, Div Rheumatol, Houston, TX USA
[13] Univ Vita Salute San Raffaele, Milan, Italy
[14] IRCCS San Raffaele Hosp, Unit Immunol Rheumatol Allergy & Rare Dis UnIRAR, Milan, Italy
[15] Salford Care Org, Dept Rheumatol, Northern Care Alliance NHS Fdn Trust, Salford, England
[16] Univ Manchester, Manchester Acad Hlth Sci Ctr, Div Musculoskeletal & Dermatol Sci, Manchester, England
[17] Northern Care Alliance NHS Fdn Trust, Salford Care Org, Dept Rheumatol, Salford, England
[18] Univ Manchester, Manchester Acad Hlth Sci Ctr, Div Musculoskeletal & Dermatol Sci, Manchester, England