[1] Med Univ Vienna, Dept Med 3, Div Rheumatol, Waehringer Guertel 18-20, A-1090 Vienna, Austria
[2] Hietzing Hosp, Dept Med 2, Vienna, Austria
[3] Amsterdam Rheumatol & Immunol Ctr, Amsterdam, Netherlands
[4] Zuyderland Med Ctr, Heerlen, Netherlands
[5] Univ Med Ctr Utrecht, Dept Rheumatol & Clin Immunol, Utrecht, Netherlands
[6] Charite, Dept Rheumatol & Clin Immunol, Berlin, Germany
[7] Free Univ, Berlin, Germany
[8] Humboldt Univ, Berlin, Germany
[9] Karolinska Inst, Dept Rheumatol, Stockholm, Sweden
[10] Hop Cochin, Rhumatol B, Paris, France
[11] Leeds Teaching Hosp NHS Trust, NIHR Leeds Musculoskeletal Biomed Res Unit, Leeds, W Yorkshire, England
[12] Univ Leeds, Leeds Inst Rheumat & Musculoskeletal Med, Leeds, W Yorkshire, England
[13] Leiden Univ Med Ctr, Dept Rheumatol, Leiden, Netherlands
[14] Univ Twente, Dept Psychol Hlth & Technol, Enschede, Netherlands
[15] Tech Univ Dresden, Univ Klinikum Carl Gustav Carus, Med Klin & Poliklin 2, Div Rheumatol, Dresden, Germany
[16] Vrije Univ Amsterdam, Med Ctr, Dept Epidemiol & Biostat, Amsterdam, Netherlands
[17] Univ Birmingham, Queen Elizabeth Hosp, IIA, Birmingham NIHR Wellcome Trust Clin Res Facil,Rhe, Birmingham, W Midlands, England
[18] Hosp Special Surg, Weill Cornell Med Coll, Dept Rheumatol, New York, NY USA
[19] Univ Toronto, Mt Sinai Hosp, Rebecca McDonald Ctr Arthrit & Autoimmune Dis, Toronto, ON, Canada
[20] Ctr Invest Clin Morelia SC, Michoacan, Mexico
[21] Univ Montpellier, UMR 5535, Lapeyronie Hosp, Rheumatol Dept, Montpellier, France
[22] Univ Genoa, Res Lab, Genoa, Italy
[23] Univ Genoa, Div Clin Rheumatol, Genoa, Italy
[24] Maastricht Univ, Dept Patient & Care, Maastricht, Netherlands
[25] Maastricht Univ, Dept Rheumatol, Maastricht, Netherlands
[26] Univ Hosp Geneva, Div Rheumatol, Geneva, Switzerland
[27] Hosp Clin Univ, Fdn Ramon Dominguez, Santiago, Spain
[28] Sorbonne Univ, Pitie Salpetriere Hosp, Dept Rheumatol, Paris, France
[29] Strasbourg Univ Hosp, Inst Biol Mol & Cellulaire Immunopathol & Chim Th, Strasbourg, France
[30] Univ Strasbourg, CNRS, Strasbourg, France
[31] Erasmus MC, Univ Med Ctr Rotterdam, Rotterdam, Netherlands
[32] Univ Manchester, Ctr Musculoskeletal Res, Arthritis Res UK Ctr Epidemiol, Manchester, Lancs, England
[33] VA Nasonova Res Inst Rheumatol, Moscow, Russia
[34] European League Rheumatism, Zurich, Switzerland
[35] Cyprus League Rheumatism, Nicosia, Cyprus
[36] Diakonhjemmet Hosp, Dept Rheumatol, Oslo, Norway
[37] Beijing Univ Peoples Hosp, Dept Rheumatol & Immunol, Beijing, Peoples R China
[38] Univ Paris Sud, Hop Univ Paris Sud, AP HP, INSERM U1184,Ctr Immunol Viral Infect & Autoimmun, Le Kremlin Bicetre, France
[39] Univ Glasgow, Coll Med Vet & Life Sci, Inst Infect Immun & Inflammat, Glasgow, Lanark, Scotland
[40] Org Med Invest, Buenos Aires, DF, Argentina
[41] Univ Queensland, Dept Med, Brisbane, Qld, Australia
[42] Charles Univ Prague, Inst Rheumatol & Clin Rheumatol, Prague, Czech Republic
[43] Semmelweis Univ, Natl Inst Rheumatol & Physiotherapy, Budapest, Hungary
[44] Pellegrin Hosp, FHU ACRONIM, Rheumatol Dept, Bordeaux, France
[45] Bordeaux Univ, UMR CNRS 5164, Bordeaux, France
[46] Dept Rheumatol, Bernhoven, Uden, Netherlands
[47] Univ Cologne, Cologne, Germany
[48] Univ Alabama Birmingham, Dept Med, Div Rheumatol, Birmingham, AL 35294 USA
[49] Ctr Hosp & Univ Coimbra Praceta Mota Pinto, Serv Reumatol, Coimbra, Portugal
[50] Med Univ Vienna, Ctr Med Stat Informat & Intelligent Syst, Sect Outcomes Res, Vienna, Austria