[1] IRCCS Ist Giannina Gaslini, Genoa, Italy
[2] PRINTO, Clin Pediat & Reumatol, Genoa, Italy
[3] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH 45229 USA
[4] PRI Res, Bad Bramstedt, Germany
[5] Natl Inst Rheumatism & Physiotherapy, Budapest, Hungary
[6] Riga Stradins Univ, Riga, Latvia
[7] Dr Ramon Ruiz Arnau Univ Hosp, Bayamon, PR USA
[8] Necker Enfants Malades Univ Hosp, AP HP, Paris, France
[9] Dalhousie Univ, Halifax, NS, Canada
[10] Childrens Hosp Pittsburgh, Pittsburg, KS USA
[11] Univ Arkansas Med Sci, Little Rock, AR 72205 USA
[12] Randall Childrens Hosp Legacy Emanuel, Portland, OR USA
[13] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[14] Hamburg Ctr Pediat & Adolescent Rheumatol, Hamburg, Germany
[15] Augusta Univ, Childrens Hosp Georgia, Med Ctr, Augusta, GA USA
[16] Bristol Myers Squibb, Princeton, NJ USA
[17] Bristol Myers Squibb, Basking Ridge, NJ USA
[18] Paediat Rheumatol Int Trials Org PRINTO, Genoa, Italy
[19] Univ Cincinnati, Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH USA