Univ Fed Sao Paulo, UNIFESP, Pediat Rheumatol Unit, Sao Paulo, Brazil; Irmandade Santa Casa de Misericordia Sao Paulo, Pediat Rheumatol Unit, Sao Paulo, Brazil; Univ Sao Paulo USP RP, Sch Med Ribeirao Preto, Dept Pediat, Ribeirao Preto, Brazil; Ist Giannina Gaslini, Paediat Rheumatol Int Trials Org PRINTO, Genoa, Italy; Univ F Rio De Janeiro, Pediat Rheumatol, Rio De Janeiro, Brazil; Hosp Univ Clementino Fraga ...