[1] Yale Sch Med, Sect Rheumatol Allergy & Immunol, Dept Med, New Haven, CT 06519 USA
[2] Med Coll Wisconsin, Div Rheumatol, Milwaukee, WI 53226 USA
[3] Univ Coll Dublin, Dept Rheumatol, Dublin, Ireland
[4] Univ Alabama Birmingham, Dept Med, Div Clin Immunol & Rheumatol, Birmingham, AL 35294 USA
[5] Univ Med Ctr Schleswig Holstein, Dept Rheumatol & Clin Immunol, Med Dept, Kiel, Germany
[6] VA Connecticut Healthcare Syst, Sect Rheumatol, Dept Med, West Haven, CT USA
[7] Temple Univ, Dept Med, Lewis Katz Sch Med, Sect Rheumatol, Philadelphia, PA 19122 USA
[8] St Louis Univ, Sch Med, Div Rheumatol, St Louis, MO USA
[9] Heidelberg Univ, Div Rheumatol, Dept Med 5, Univ Med Ctr Mannheim,Med Fac Mannheim, Heidelberg, Germany
[10] Boston Univ, Sch Med, Dept Med, Sect Rheumatol, Boston, MA 02118 USA
[11] UCL, Ctr Rheumatol, London, England
[12] UCL, Dept Neuromuscular Dis, London, England
[13] Univ Coll London Hosp NHS Fdn Trust, Natl Inst Hlth Res NIHR Univ Coll London Hosp Bio, London, England
[14] Univ Queensland, Sch Clin Med, Herston, Qld, Australia
[15] Univ Washington, Dept Med, Div Rheumatol, Seattle, WA 98195 USA
[16] NSW Hlth, Sydney, NSW, Australia
[17] UCL, Dept Rheumatol, Div Med, London, England
[18] Massachusetts Gen Hosp, Clin Epidemiol Program, Div Rheumatol Allergy & Immunol, Boston, MA 02114 USA
[19] Harvard Med Sch, Boston, MA 02115 USA
[20] Univ Otago, Dept Med, Wellington, New Zealand
[21] Johns Hopkins Sch Med, Dept Med, Div Rheumatol, Baltimore, MD USA