[1] Univ Otago, Dept Med, Wellington 6039, New Zealand
[2] Radboud Univ Nijmegen, Med Ctr, Dept Rheumatol, NL-6525 ED Nijmegen, Netherlands
[3] Univ Auckland, Dept Med, Auckland, New Zealand
[4] Boston Univ, Sch Med, Clin Epidemiol Res & Training Unit, Boston, MA 02118 USA
[5] Univ Penn, Vet Adm Med Ctr, Philadelphia, PA 19104 USA
[6] Chiang Mai Univ, Fac Med, Dept Internal Med, Div Rheumatol, Chiang Mai 50000, Thailand
[7] Hosp Gen Mexico City, Serv Reumatol, Mexico City, DF, Mexico
[8] Nasonova Res Inst Rheumatol Russia, Moscow, Russia
[9] Univ Coll Dublin, Sch Med & Med Sci, Dublin 2, Ireland
[10] Mater Misericordiae Univ Hosp, Dept Rheumatol, Dublin, Ireland
[11] Univ Otago, Dept Med, Canterbury, New Zealand
[12] Hosp Univ Cruces, Div Rheumatol, Vizcaya, Spain
[13] BioCruces Hlth Res Inst, Vizcaya, Spain
[14] Hosp Gen Univ Elda, Dept Reumatol, Alicante, Spain
[15] Univ Paris Diderot, Sorbonne Paris Cite, UFR Med, Paris, France
[16] Hop Lariboisiere, INSERM, UMR 1132, F-75475 Paris, France
[17] Hop Lariboisiere, AP HP, Serv Rhumatol, Ctr Viggo Petersen, F-75475 Paris, France
[18] Westfries Gasthuis, Amsterdam Rheumatol Immunol Ctr ARC, Dept Rheumatol, Hoorn, Netherlands
[19] Italian Soc Rheumatol SIR, Epidemiol Unit, Milan, Italy
[20] Univ Pavia, Div Rheumatol, I-27100 Pavia, Italy
[21] IRCCS Policlin S Matteo Fdn, Pavia, Italy
[22] Buddhist Tzu Chi Med Fdn, Taichung Tzu Chi Hosp, Div Rheumatol & Immunol, Taichung, Taiwan
[23] Taichung Vet Gen Hosp, Taichung, Taiwan
[24] Univ Hosp Carl Gustav Carus, Dept Internal Med 3, Div Rheumatol, Dresden, Germany
[25] Univ Estado Rio de Janeiro, Dept Internal Med, Div Rheumatol, Rio De Janeiro, Brazil
[26] Rijnstate Hosp, Dept Rheumatol, Arnhem, Netherlands
[27] China Med Univ, Sch Med, Taichung, Taiwan
[28] China Med Univ Hosp, Dept Internal Med, Taichung, Taiwan
[29] Copenhagen Univ Hosp Glostrup, Ctr Rheumatol & Spine Disorders, Glostrup, Denmark
[30] Univ Genoa, Dept Internal Med, Res Lab, I-16126 Genoa, Italy
[31] Univ Genoa, Dept Internal Med, Acad Div Clin Rheumatol, I-16126 Genoa, Italy
[32] Diakonhjemmet Hosp, Dept Rheumatol, Natl Advisory Unit Rehabil Rheumatol, Oslo, Norway