[1] Copenhagen Univ Hosp, Copenhagen Ctr Arthrit Res COPECARE, Ctr Rheumatol & Spine Dis, Ctr Head & Orthopaed, Glostrup, Denmark
[2] Univ Gothenburg, Dept Rheumatol & Inflammat Res, Sahlgrenska Acad, Gothenburg, Sweden
[3] Charles Univ Prague, Fac Med 1, Inst Rheumatol, Prague, Czech Republic
[4] Charles Univ Prague, Fac Med 1, Dept Rheumatol, Prague, Czech Republic
[5] Demiroglu Bilim Univ, Dept Rheumatol, Istanbul, Turkiye
[6] Asst Gaetano Pini CTO Inst, Div Clin Rheumatol, Milan, Italy
[7] Geneva Univ Hosp, Dept Rheumatol, Geneva, Switzerland
[8] Diakonhjemmet Hosp, Dept Rheumatol & Res, Oslo, Norway
[9] Hosp Southern Norway Trust, Dept Med, Div Rheumatol, Kristiansand, Norway
[10] Copenhagen Univ Hosp Glostrup, Ctr Head & Orthopaed, Ctr Rheumatol & Spine Dis, COPECARE, Kristiansand, Norway
[11] Univ Lisbon, Hosp Santa Maria, Ctr Acad Med Lisboa, Inst Med Mol,Fac Med,CHULN,Dept Rheumatol, Lisbon, Portugal
[12] Univ Aberdeen, Aberdeen Ctr Arthrit & Musculoskeletal Hlth, Epidemiol Grp, Aberdeen, Scotland
[13] Carol Davila Univ Med & Pharm, Bucharest, Romania
[14] Helsinki Univ Hosp, Inflammat Ctr, Dept Rheumatol, Helsinki, Finland
[15] Spanish Soc Rheumatol, Res Unit, Madrid, Spain
[16] Univ Ljubljana, Dept Rheumatol, Univ Med Ctr Ljubljana, Ljubljana, Slovenia
[17] Univ Ljubljana, Fac Med, Ljubljana, Slovenia
[18] Univ Hosp, Dept Rheumatol, Reykjavik, Iceland
[19] Radboud Univ Nijmegen Med Ctr, Dept Rheumatol, Nijmegen, Netherlands
[20] Karolinska Inst, Dept Med Solna, Stockholm, Sweden
[21] Aarhus Univ, Aarhus Univ Hosp, Dept Rheumatol, Aarhus, Denmark
[22] Aarhus Univ, Dept Clin Med, Aarhus, Denmark
[23] Inst Biostat & Anal Ltd, Brno, Czech Republic
[24] Marmara Univ, Dept Rheumatol, Sch Med, Istanbul, Turkiye
[25] Univ Bari, Rheumatol Unit, DETO, Bari, Italy
[26] Univ Zurich, Univ Hosp Zurich, Dept Rheumatol, Zurich, Switzerland
[27] Hosp Garcia Orta, Dept Rheumatol, Almada, Portugal
[28] Univ Med & Pharm, Ctr Rheumat Dis, Bucharest, Romania
[29] Hosp Clin Univ, Rheumatol Serv, Santiago De Compostela, Spain
[30] Univ Iceland, Landspitali Univ Hosp, Ctr Rheumatol Res, Reykjavik, Iceland
[31] Univ Iceland, Fac Med, Reykjavik, Iceland
[32] Vrije Univ Amsterdam Med Ctr, Dept Rheumatol, Amsterdam UMC, Amsterdam, Netherlands
[33] Copenhagen Univ Hosp, COPECARE, Ctr Rheumatol & Spine Dis, Ctr Head & Orthopaed, Glostrup, Denmark
[34] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark