[1] Univ Geneva, Geneva, Switzerland
[2] Univ Bari, Rheumatol Unit, DIMIMP, Bari, Italy
[3] Hosp Clin Santiago, Santiago De Compostela, Spain
[4] Diakonhjemmet Hosp, Oslo, Norway
[5] Radboud Univ Nijmegen, Med Ctr, NL-6525 ED Nijmegen, Netherlands
[6] Glostrup Cty Hosp, Danish Rheumatol Database DANBIO, Copenhagen, Denmark
[7] Charles Univ Prague, Dept Clin & Expt Rheumatol, Prague, Czech Republic
[8] Lund Univ, Malmo, Sweden
[9] Bicetre Univ Hosp, Le Kremlin Bicetre, France
[10] Strasbourg Univ Hosp, Strasbourg, France