[1] Geneva Univ Hosp, Div Rheumatol, Geneva, Switzerland
[2] LUMC, Rheumatol, Leiden, Netherlands
[3] CHUM, Inst Rech Rhumatol, Montreal, PQ, Canada
[4] Univ Med, Ctr Rheumat Dis, Bucharest, Romania
[5] Aalborg Univ Hosp, Rheumatol, DANBIO, Aalborg, Denmark
[6] Vrije Univ Brussels, Dept Publ Hlth, Biostat & Med Informat Res Grp, Brussels, Belgium
[7] Tel Aviv Univ, Rheumatol, Tel Aviv, Israel
[8] DRFZ, Programme Area Epidemiol, Berlin, Germany
[9] Univ Manchester, Ctr Epidemiol Versus Arthrit, Manchester, Lancs, England
[10] Univ Hosp Bari, GISEA, Rheumatol, Bari, Italy
[11] Marmara Univ, Sch Med, Rheumatol, Istanbul, Turkiye
[12] Diakonhjemmet Hosp, Ctr Treatment Rheumat & Musculoskeletal Dis REMED, Oslo, Norway
[13] BioReg, Vienna, Austria
[14] AS Loginov Moscow Clin Sci Ctr, VA Nasonova Res Inst, Rheumatol, Moscow, Russia
[15] Helsinki Univ Hosp, ROB FIN, Helsinki, Finland
[16] Dokuz Eylul Univ, Fac Med, Dept Internal Med, Div Rheumatol, Izmir, Turkiye
[17] Inst Rheumatol, Rheumatol, Prague, Czech Republic
[18] Hosp Clin Univ, Rheumatol, Santiago De Compostela, Spain
[19] Univ Nova Lisboa, Inst Med Mol, NOVA Med Sch,CHRC, Rheumatol Res Unit,Rheuma Pt,Soc Portuguesa Rheum, Lisbon, Portugal
[20] Univ Med Ctr Ljubljana, Ljubljana, Slovenia
[21] Univ Ljubljana, Rheumatol, Ljubljana, Slovenia