[1] Univ Padua, Pediat Rheumatol, I-35128 Padua, Italy
[2] Hosp Barcelona, Pediat Rheumatol, Barcelona, Spain
[3] Inst Recerca St Joan de Deu, Barcelona, Spain
[4] Univ Childrens Hosp Ljubljana, Pediat Rheumatol, Ljubljana, Slovenia
[5] Alder Hey Childrens NHS Fdn Trust, Paediat Rheumatol, Liverpool, Merseyside, England
[6] Univ Adelaide, Womens & Childrens Hosp, Discipline Paediat, Adelaide, SA, Australia
[7] Sydney Childrens Hosp Network Randwick & Westmead, Pediat, Sydney, NSW, Australia
[8] Semmelweis Univ, Unit Paediat Rheumatol, Budapest, Hungary
[9] Istanbul Univ, Cerrahpasa Med Fac, Pediat Rheumatol, Istanbul, Turkey
[10] Inst Puericultura & Pediat Martagao Gesteira, Pediat, Rio De Janeiro, Brazil
[11] Great Ormond St Hosp NHS Trust, Rheumatol, London, England
[12] Hosp Pediat Juan P Garrahan, Serv Inmunol Reumatol, Buenos Aires, DF, Argentina
[13] Univ Med Ctr Utrecht, Wilhelmina Childrens Hosp, Dept Paediat Immunol, Utrecht, Netherlands
[14] UNESP, Hosp Clin, Fac Med Botucatu, Dept Pediat, Botucatu, SP, Brazil
[15] Klinikum Eilbek, Hamburger Zentrum Kinder & Jugendrheumatol, Hamburg, Germany