[1] Hop Bicetre, AP HP, Dept Rheumatol, INSERM,U802, F-94275 Le Kremlin Bicetre, France
[2] Ctr Clin Epidemiol, Paris, France
[3] Univ Paris 05, INSERM, U738, Paris, France
[4] Univ Paris 11, Le Kremlin Bicetre, France
[5] INSERM, U1012, F-94275 Le Kremlin Bicetre, France
[6] Univ Groningen, Univ Med Ctr Groningen, Dept Rheumatol & Clin Immunol, NL-9713 AV Groningen, Netherlands
[7] Lund Univ, Malmo Univ Hosp, Dept Rheumatol, Lund, Sweden
[8] Univ Hosp, Charite, Dept Rheumatol, Berlin, Germany
[9] Hosp Clin Barcelona, Lab Autoimmune Dis Josep Font, Barcelona, Spain
[10] Univ Pisa, Dept Internal Med, Rheumatol Unit, Pisa, Italy
[11] Claude Huriez Hosp, Dept Internal Med, Lille, France
[12] Haukeland Hosp, Dept Rheumatol, N-5021 Bergen, Norway
[13] Univ Med Ctr Utrecht, Dept Rheumatol & Clin Immunol, Utrecht, Netherlands
[14] Univ Med Ctr Utrecht, Dept Rheumatol, Utrecht, Netherlands
[15] Univ Clin Ctr Ljubljana, Dept Rheumatol, Ljubljana, Slovenia
[16] Univ Strasbourg, Strasbourg Univ Hosp, Dept Rheumatol, Strasbourg, France
[17] Hop Cavale Blanche, Dept Rheumatol, Brest, France
[18] Univ Udine, Univ Hosp Udine, Clin Rheumatol, I-33100 Udine, Italy
[19] German Hosp, Dept Rheumatol, Buenos Aires, DF, Argentina
[20] Univ Athens, Sch Med, Dept Pathophysiol, GR-11527 Athens, Greece
[21] Winthrop Univ Hosp, Div Rheumatol Allergy & Immunol, Mineola, NY 11501 USA
[22] Barts & Royal London Hosp, Dept Rheumatol, London, England
[23] Villamarina Hosp, Dept Internal Med, Piombino, Italy
[24] Villamarina Hosp, Rheumatol Sect, Piombino, Italy
[25] Univ Hosp Birmingham NHS Fdn Trust, Dept Rheumatol, Birmingham, W Midlands, England