Hamburg Ctr Pediat & Adolescent Rheumatol, Hamburg, Germany; German Rheumatism Res Ctr, Epidemiol Unit, Berlin, Germany; Istanbul Univ, Cerrahpasa Med Sch, Dept Pediat Rheumatol, Pediat Rheumatol, Istanbul, Turkey; Istanbul Univ, Cerrahpasa Med Sch, Dept Pediat Rheumatol, Istanbul, Turkey; Riga Stradins Univ, Pediat cathedra, Riga, Latvia; Fed Univ Sao Paulo UNIFESP, Pediat Rheumatol Unit, Sao Paulo, Brazil; Ch...
German Rheumatism Res Ctr, Epidemiol Unit, Berlin, Germany; Hamburg Ctr Pediat & Adolescent Rheumatol, Hamburg, Germany; Istanbul Univ, Cerrahpasa Med Sch, Dept Pediat Rheumatol, Pediat Rheumatol, Istanbul, Turkey; Univ Ghent, Fac Internal Med, Ghent, Belgium; Univ Fed Rio de Janeiro, Rio De Janeiro, Brazil; Hosp Pediat Prof Dr JP Garrahan, Serv Immunol & Rheumatol, Buenos Aires, DF, Argentina; Osped Pediat Ann...