University of L'Aquila, University of Siena, University of Siena, University of Bari, UOD Reumatologia- Grande Ospedale Metropolitano, University of Bari, 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, National and Kapodistrian University of Athens - 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, University of Bari, University of Palermo - Department PROMISE, University of Milan, University of Bari, University of Bari, 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

University College London, National and Kapodistrian University of Athens, University College London, University College London - Centre for Rheumatology Research, University College London, University College London, Vascular Noninvasive Diagnostic Centre, Imperial College London, University College London - Centre for Adolescent Rheumatology Versus Arthritis, University College London, University College London and University College London - GOSH and Centre for Rheumatology Research