IRCCS Istituto Giannina Gaslini - Paediatric Rheumatology International Trials Organisation (PRINTO), IRCCS Istituto Giannina Gaslini, IRCCS Istituto Giannina Gaslini, IRCCS Istituto Giannina Gaslini, Utrecht University - Wilhelmina Children’s Hospital, Sanjay Gandhi Post Graduate Institute of Medical Sciences - Department of Clinical Immunology and Rheumatology, King Faisal Specialist Hospital and Research Centre, IRCCS Istituto Giannina Gaslini, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Western University Children’s Hospital, University of Oslo, University Hospital Münster, Hospital Sor Maria Ludovica, Hospital Sor Maria Ludovica, Cincinnati Children's Hospital Medical Center, IRCCS Istituto Giannina Gaslini, University of Calgary - Alberta Children's Hospital, Sofiamed, Juliane Marie Centret, National Institute of Rheumatology and Physiotherapy, University of Latvia, São Paulo State University (UNESP), Tehran University of Medical Sciences - Dr. Shariati Hospital, Institute of Rheumatology of Belgrade, Thessaloniki University, Utrecht University - Wilhelmina Children’s Hospital, IRCCS Istituto Giannina Gaslini, IRCCS Istituto Giannina Gaslini, IRCCS Istituto Giannina Gaslini and Independent

Pediatrics Clinic, ASST Spedali Civili di Brescia, University of Brescia, University of Trieste, Independent, Division of Rheumatology, Bambino Gesù Children's Hospital, IRCCS “Burlo Garofolo” - Institute for Maternal and Child Health, Paediatric Department, Hospital Papa Giovanni XXIII,, Pediatrics Clinic, ASST Spedali Civili di Brescia, University of Brescia, Department of Paediatrics, Pediatria 2, Santobono-Pausilipon Children's Hospital, UOSD Centro Malattie Autoinfiammatorie ed Immunodeficienze, IRCCS Istituto Giannina Gaslini, University of Milan - Department of Clinical and Biological SciencesUniversity of Milan - Department of Pediatrics, University of Bologna - Department of Pediatrics, Department of Pediatrics and Public Health, University of Turin, Department of Woman’s and Child’s Health, University of Padova, IRCCS Istituto Giannina Gaslini, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, University of Milan, Pediatric Rheumatology Center, Pediatric Unit, "Giovanni XXIII", Pediatric Hospital, Bambino Gesù Children's Hospital, Pediatric Rheumatology Unit, AOU Meyer, University of Florence, Bambino Gesù Children's Hospital, Department of Clinical Sciences and Community Health, University of Milan, IRCCS Istituto Giannina Gaslini - Paediatric Rheumatology International Trials Organisation (PRINTO), University of Trieste - Institute for Maternal and Child Health and Independent