[1] Cincinnati Childrens Hosp Med Ctr, PRCSG, Cincinnati, OH 45229 USA
[2] Ist Giannina Ciaslini Pediat II Reumatol, Pediat Rheumatol Int Trial Org PRINTO, Genoa, Italy
[3] Asklepios Clin Sankt Augustin, Cologne, Germany
[4] Univ Hosp Cologne, Cologne, Germany
[5] Hosp Ramon & Cajal, Unidad Reumatol Pediat, Madrid, Spain
[6] Univ Freiburg, Med Fac, Univ Med Ctr, Dept Pediat & Adolescent Med, Freiburg, Germany
[7] Roche Innovat Ctr, New York, NY USA
[8] Roche Prod Ltd, Welwyn Garden City, Herts, England
[9] IRCCS Osped Pediat Bambino Gesu, Rome, Italy