[1] Paris Descartes Univ, Cochin Hosp, Rheumatol A, Paris, France
[2] German Rheumatism Res Ctr, Epidemiol Unit, Berlin, Germany
[3] Lille Univ, Hop Claude Huriez, Dept Internal Med, Lille, France
[4] Rambam Hlth Care Campus, Shine Rheumatol Unit B, Haifa, Israel
[5] Univ Lubeck, Dept Rheumatol, Lubeck, Germany
[6] Charite, Dept Rheumatol & Clin Immunol, Berlin, Germany
[7] Spedali Civil Brescia, Rheumatol & Clin Immunol, Brescia, Italy
[8] Hosp Univ 12 Octubre, Serv Rheumatol, Madrid, Spain
[9] F Magrassi II, Dept Clin & Expt Med, Napoly, Italy
[10] Univ Padua, Rheumatol Unit, Padua, Italy
[11] Hosp Bispebjerg, Univ Copenhagen Hosp, Dept Dermatol, Copenhagen, Denmark
[12] Univ Pecs, Dept Immunol & Rheumatol, Pecs, Hungary