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

University of L'Aquila, University of Siena, University of Siena, Università degli Studi di Bari “Aldo Moro” (UNIBA), UOD Reumatologia- Grande Ospedale Metropolitano, Università degli Studi di Bari “Aldo Moro” (UNIBA), University of São Paulo (USP), University of São Paulo (USP), University of São Paulo (USP), King Saud University - Department of Rheumatology, King Saud University, King Saud University, - First Department of Propaedeutic and Internal Medicine, National and Kapodistrian University of Athens, National and Kapodistrian University of Athens, University of Campania Luigi Vanvitelli, University of Campania Luigi Vanvitelli, University of Campania Luigi Vanvitelli, Cairo University, Cairo University, University of Ferrara, University of Ferrara, Marmara University, Marmara University, Unità Operativa di Immunoreumatologia-Area Medicina Clinica Policlinico Universitario Campus Bio-Medico di Roma, Università Campus Bio-Medico di Roma, University of Perugia, University of Perugia, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán - Department of Immunology and Rheumatology, University of L'Aquila - Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila - Department of Biotechnological and Applied Clinical Sciences, University of Barcelona, University of Barcelona, Università Vita-Salute San Raffaele - IRCCS San Raffaele Scientific Institute, IRCCS Ospedale San Raffaele & Vita-Salute San Raffaele University - Unit of Immunology, Medical University of Lodz - Department of Internal Medicine, Medical University of Lodz, University of Turin, University of Turin, University of Siena, University of Siena, University of Siena, University of Naples Federico II, University of Florence, University of Padua, University of Pavia, Ankara Yildirim Beyazit University - Ankara City Hospital, Sapienza University of Rome, Sapienza University of Rome, Azienda Ospedaliera Universitaria 27 (AOU), "G. Martino" Messina, University of Campania Luigi Vanvitelli, University of Catania, Mansoura University, Università degli Studi di Bari “Aldo Moro” (UNIBA), - Department PROMISE, University of Milan, Università degli Studi di Bari “Aldo Moro” (UNIBA), Università degli Studi di Bari “Aldo Moro” (UNIBA), University of Antwerp, Central Hospital of Bolzano, San Camillo Forlanini Hospital, University of Bucharest, University of Brescia, University of Verona, Fatebenefratelli Hospital, San Salvatore Hospital, National and Kapodistrian University of Athens, Gazi University, Gazi University, University of Warsaw, University of Warsaw, University of Siena, University of Siena, Fondazione Policlinico Universitario A. Gemelli IRCCS, University of Siena and Azienda Ospedaliero Universitaria di Modena - Department of Neuroscience