[1] Univ Manchester, Ctr Epidemiol Versus Arthrit, Manchester, Lancs, England
[2] Univ Manchester, Ctr Genet & Genom Versus Arthrit, Ctr Musculoskeletal Res, Manchester, Lancs, England
[3] Manchester Univ NHS Fdn Trust, Natl Inst Hlth Res, Manchester Acad Hlth Sci Ctr, Manchester Biomed Res Ctr, Manchester, Lancs, England
[4] Hosp Civils Lyon, Pediat Rheumatol Unit, Lyon, France
[5] Hop Necker Enfants Malad, Pediat Hematol Immunol & Rheumatol Dept, Reference Ctr Rheumat AutoImmune & Syst Dis Child, Paris, France
[6] Paris Univ, Lab Immunogenet Paediat Autoimmun, Imagine Inst, Paris, France
[7] Hop Robert Debre Gen Pediat Infect Dis, Reference Ctr Rheumat AutoImmune & Syst Dis Child, Paris, France
[8] Hop Robert Debre Gen Pediat Infect Dis, Internal Med Dept, Paris, France
[9] Univ Paris Sud Saclay, Bicetre Hosp, AP HP, CeReMAIA, Paris, France
[10] Hosp Nino Jesus, Unidad Reumatol Pediat, Madrid, Spain
[11] Hosp Univ Cruces, Reumatol Pediat, Baracaldo, Spain
[12] Charles Univ Prague, Ctr Paediat Rheumatol & Autoinflammatory Dis, Dept Paediat & Inherited Metab Disorders, Fac Med 1, Prague, Czech Republic
[13] Charles Univ Prague, Gen Univ Hosp, Prague, Czech Republic
[14] Carmel Hosp, Pediat Rheumatol Unit, Haifa, Israel
[15] Hebrew Univ Jerusalem, Univ Med Ctr, Dept Pediat Hadassah Hebrew, Fac Med, Jerusalem, Israel
[16] Univ Med Ctr, Dept Pediat Immunol & Rheumatol, Wilhelmina Childrens Hosp, Utrecht, Netherlands
[17] German Rheumatism Res Ctr DRFZ Berlin, Epidemiol & Hlth Care Res Unit, Berlin, Germany
[18] Univ Ferrara, Rheumatol Unit, Dept Med Sci, Ferrara, Italy
[19] Portuguese League Rheumat Dis, LPCDR, Lisbon, Portugal
[20] European League Rheumatism EULAR Standing Comm, People Arthritis Rheumatism Europe PARE, Kilchberg, Switzerland
[21] UCL, Ctr Rheumatol & Dept Neuromuscular Dis, London, England
[22] UCL, Natl Hlth Serv NHS Trust, Natl Inst Hlth Res NIHR, Hosp Biomed Res Ctr, London, England
[23] Northwick Pk Hosp & Clin Res Ctr, London North West Univ Healthcare NHS Trust, Dept Rheumatol, London, England
[24] Meir Med Ctr, Pediat Rheumatol Unit, Dept Pediat, Kfar, Israel
[25] Tel Aviv Univ, Sackler Fac Med, Tel Aviv, Israel