[1] Univ Zurich, Univ Zurich Hosp, Dept Rheumatol, Zurich, Switzerland
[2] Federat European Scleroderma Assoc FESCA, Paris, France
[3] Univ Paris 05, Dept Rheumatol, Paris, France
[4] Cochin Hosp, Paris, France
[5] Hosp Univ 12 Octubre, Dept Rheumatol, Madrid, Spain
[6] Univ Pecs, Sch Med, Dept Immunol & Rheumatol, Pecs, Hungary
[7] UCL, Ctr Rheumatol, Royal Free Campus, London, England
[8] Lund Univ, Dept Rheumatol, Lund, Sweden
[9] Med Univ Bialystok, Dept Rheumatol & Internal Med, Bialystok, Poland
[10] Univ Florence, Careggi Univ Hosp, Div Rheumatol, Dept Expt & Clin Med, Florence, Italy
[11] Carol Davila Univ Med & Pharm, Cantacuzino Hosp, Dept Internal Med & Rheumatol, Bucharest, Romania
[12] Justus Liebig Univ Giessen, Dept Rheumatol & Clin Immunol, Campus Kerckhoff, Bad Nauheim, Germany
[13] Diakonhjemmet Hosp, Div Rheumatol & Res, Oslo, Norway
[14] Oslo Univ Hosp, Reg Res Support, Oslo, Norway
[15] IRCCS San Raffaele Hosp, Unit Immunol Rheumatol Allergy & Rare Dis UnIRAR, Milan, Italy