[1] Karolinska Inst, S-10401 Stockholm, Sweden
[2] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[3] Inst Rheumatol, ARBITER, Moscow, Russia
[4] Copenhagen Univ Hosp, Dept Rheumatol, DANBIO, Glostrup, Denmark
[5] Aarhus Univ Hosp, Dept Rheumatol, Aarhus, Denmark
[6] Charles Univ Prague, CR-11636 Prague 1, Czech Republic
[7] Univ Hosp Geneva, SCQM Registry, Geneva, Switzerland
[8] Univ Helsinki, Cent Hosp, ROB FIN, FIN-00014 Helsinki, Finland
[9] Inst Mol Med, Rheumatol Res Unit, Lisbon, Portugal
[10] Univ Med Ctr, BioRx Si, Ljubljana, Slovenia
[11] Univ Santiago, Hosp Clin, Santiago De Compostela, Spain
[12] Cantacuzino Hosp, Bucharest, Romania
[13] Karolinska Inst, Unit Clin Res Therapy, Inflammatory Dis, S-10401 Stockholm, Sweden
[14] Karolinska Inst, Dept Med, Rheumatol Unit, S-10401 Stockholm, Sweden