[1] Univ Med Ctr Utrecht, Utrecht, Netherlands
[2] St Joan de Deu Hosp, Madrid, Spain
[3] Univ Ljubljana, Med Ctr, Ljubljana, Slovenia
[4] IRCCS Osped Pediat Bambino Gesu, Lab Immunorheumatol, Div Rheumatol, Rome, Italy
[5] IRCCS Osped Pediat Bambino Gesu, Div Rheumatol, Rome, Italy
[6] UCL, Inst Child Hlth, London, England
[7] Great Ormond St Hosp NHS Fdn Trust, London, England
[8] Semmelweiss Univ Hosp, Budapest, Hungary
[9] Univ Genoa, Genoa, Italy
[10] Univ Hosp Prague, Prague, Czech Republic
[11] Great Ormond St Hosp NHS Fdn Trust, Sect Head Infect Immunol & Rheumatol, London, England
[12] Newcastle Univ, Newcastle Upon Tyne, Tyne & Wear, England
[13] Univ Hosp Munster, Munster, Germany
[14] Hop Necker Enfants Malad, Paris, France
[15] Deutsch Rheuma Forschungszentrum Berlin, Berlin, Germany
[16] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Milan, Italy
[17] Necker Enfants Malades Univ Hosp, AP HP, Paris, France
[18] Ist Giannina Gaslini, Genoa, Italy
[19] IRCCS Ist Giannina Gaslini, PRINTO, Genoa, Italy
[20] Meir Med Ctr, Kefar Sava, Israel
[21] Univ Hosp Muenster, Munster, Germany
[22] Univ Hosp Leuven, Leuven, Belgium
[23] Univ Hosp Ljubljana, Ljubljana, Slovenia