[1] Rigshosp, Ctr Head & Orthopaed, Ctr Rheumatol & Spine Dis, EuroSpA Coordinating Ctr,Copenhagen Ctr Arthrit R, Glostrup, Denmark
[2] Rigshosp, Ctr Rheumatol & Spine Dis, Ctr Head & Orthopaed, DANBIO Registry, Glostrup, Denmark
[3] Univ Gothenburg, Sahlgrenska Acad, Dept Rheumatol & Inflammat Res, Gothenburg, Sweden
[4] Geneva Univ Hosp, Dept Rheumatol, Geneva, Switzerland
[5] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[6] Charles Univ Prague, Fac Med 1, Inst Rheumatol, Prague, Czech Republic
[7] Charles Univ Prague, Dept Rheumatol, Prague, Czech Republic
[8] Univ Lisbon, Fac Med, Reumapt Registry, Lisbon, Portugal
[9] Univ Lisbon, Fac Med, Inst Med Mol, Lisbon, Portugal
[10] Spanish Soc Rheumatol, Res Unit, Madrid, Spain
[11] Univ Helsinki, ROB FIN Registry, Helsinki, Finland
[12] Helsinki Univ Hosp, Helsinki, Finland
[13] Biorxsi, Ljubljana, Slovenia
[14] Univ Med Ctr Ljubljana, Dept Rheumatol, Ljubljana, Slovenia
[15] Univ Hosp, Ctr Rheumatol Res, Reykjavik, Iceland
[16] Univ Iceland, Fac Med, Reykjavik, Iceland
[17] Dokuz Eylul Univ, TURKBIO Registry, Sch Med, Izmir, Turkey
[18] Dokuz Eylul Univ, Div Rheumatol, Sch Med, Izmir, Turkey
[19] Univ Med & Pharm, Ctr Rheumat Dis, Bucharest, Romania
[20] Inselspital Bern, Leitender Arzt Univ Klin Rheumatol Immunol & Alle, Bern, Switzerland
[21] Univ Aveiro, Ctr Hosp Baixo Vouga, Rheumapt Registry, Rheumatol Dept, Aveiro, Portugal
[22] Univ Aveiro, Inst Biomed, Ibimed, Aveiro, Portugal
[23] Helsinki Univ Hosp, Inflammat Ctr, Dept Rheumatol, Helsinki, Finland
[24] Landspitali Univ Hosp, Reykjavik, Iceland
[25] Aarhus Univ Hosp, Dept Rheumatol, Aarhus, Denmark
[26] Acad Med Ctr, Amsterdam Rheumatol & Immunol Ctr ARC, Amsterdam, Netherlands
[27] Vrije Univ Amsterdam, Med Ctr Amsterdam, Dept Rheumatol, Amsterdam UMC, Amsterdam, Netherlands
[28] Univ Aberdeen, Sch Med Med Sci & Nutr, Epidemiol Grp, Aberdeen, Scotland
[29] Univ Bari, Rheumatol Unit DETO, GISEA Registry, Bari, Italy
[30] Zitelabs Aps, Copenhagen, Denmark
[31] Univ Copenhagen, Dept Clin Med, Copenhagen, Denmark