[1] Univ Udine, Rheumatol Inst, Dept Med, Udine, Italy
[2] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[3] Sorbonne Univ, Pitie Salpetriere Hosp, Paris, France
[4] Ruhr Univ Bochum, Rheumazentrum Ruhrgebiet Herne, Bochum, Germany
[5] Med Univ Vienna, Div Rheumatol, Dept Med Vienna 3, Vienna, Austria
[6] Acad Rheumatol Ctr, Dipartimento Sci Clin & Biol, Turin, Italy
[7] Sect Dermatol & Venereol, Dept Med, Verona, Italy
[8] Natl Inst Musculoskeletal Dis, Rheumatol Dept 3, H-9 Budapest, Hungary
[9] Geneva Univ Hosp, Div Dermatol & Venereol, Geneva, Switzerland
[10] Univ Belgrade, Sch Med, Belgrad, Serbia
[11] Univ Udine, C Azienda Sanit Univ Friuli Cent, Dermatol Inst, Dept Med, Udine, Italy
[12] Charite Univ Med Berlin, Berlin, Germany
[13] Univ Autonoma Barcelona, Hosp Santa Creu & St Pau, Dept Dermatol, IIB St Pau, Barcelona, Spain
[14] Hosp Univ Cent Asturias, Rheumatol Div, Oviedo, Spain
[15] Hosp Univ Cent Asturias, Fac Med, Oviedo, Spain
[16] Oviedo Univ, Oviedo, Spain
[17] Dept Biotechnol & Appl Clin Sci, Rheumatol Unit, Laquila, Italy
[18] Friedrich Alexander Univ Erlangen Nurnberg FAU, Rheumatol & Immunol, Erlangen, Germany
[19] Univ Klinikum, Dept Internal Med 3, Erlangen, Germany
[20] Univ Glasgow, Sch Infect & Immun, Glasgow, Lanark, Scotland
[21] Karolinska Inst, Dept Med Solna, Div Rheumatol, Stockholm, Sweden
[22] IRCCS Sacro Cuore Don Calabria Hosp, Dept Rheumatol, Verona, Italy
[23] Univ Ghent, VIB UGent Ctr Inflammat Res, Dept Internal Med & Pediat, Ghent, Belgium
[24] Leiden Univ, Med Ctr, Dept Rheumatol, Leiden, Netherlands