[1] Univ Hosp Zuerich, Rheumatol, Zurich, Switzerland
[2] Royal Free London NHS Fdn Trust, London, England
[3] Radboud Univ Nijmegen, Med Ctr, Rheumatol, Nijmegen, Netherlands
[4] Federat European Sclerodenna Assoc, Dublin, Ireland
[5] Univ Paris 05, Rheumatol, Paris, France
[6] Cochin Hosp, Paris, France
[7] Hosp Univ 12 Octubre, Rheumatol, Madrid, Spain
[8] Univ Complutense Madrid, Madrid, Spain
[9] Univ Pecs, Fac Med, Immunol & Rheumatol, Pecs, Hungary
[10] Royal Free & Univ Coll London, Med Sch, Rheumatol, Royal Free Campus, London, England
[11] Lund Univ, Rheumatol, Lund, Sweden
[12] Med Univ Bialystok, Dept Rheumatol & Internal Med, Bialystok, Poland
[13] Univ Florence, Rheumatol, Florence, Italy
[14] Carol Davila Univ Med & Pharm, Cantacuzino Hosp, Internal Med & Rheumatol, Bucharest, Romania
[15] Justus Liebig Univ Giessen, Kerckhoff Klin Bad Nauheim, Rheumatol & Clin Immunol, Bad Nauheim, Germany
[16] Oslo Univ Hosp, Res Support Serv CTU, Oslo, Norway
[17] Oestfold Univ Coll, Hlth & Social Sci, Oslo, Norway