1. Department of Pediatric Immunology and Rheumatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, and Faculty of Medicine Utrecht University Utrecht The Netherlands
2. Centre for Epidemiology Versus Arthritis The University of Manchester Manchester UK
3. Epidemiology Unit German Rheumatism Research Centre Berlin Berlin Germany
4. Epidemiology Unit, German Rheumatism Research Centre Berlin, and Department of Pediatric Respiratory Medicine, Immunology and Critical Care Medicine, Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt‐Universität zu Berlin Berlin Germany
5. Department of Ophthalmology, St. Franziskus Hospital, Münster, Germany, and University of Duisburg‐Essen Essen Germany
6. Centre for Epidemiology Versus Arthritis, The University of Manchester, and NIHR Manchester BRC, Manchester University NHS Foundation Trust Manchester Academic Health Science Centre Manchester UK
7. Department of Ophthalmology University Medical Center Utrecht Utrecht The Netherlands
8. Sestre Milosrdnice University Hospital Center Zagreb, Zagreb, Croatia, and University of Zagreb School of Medicine Zagreb Croatia
9. Dipartimento della Donna del Bambino e di Chirurgia Generale e Specialistica Università degli Studi della Campania L.Vanvitelli Naples Italy
10. Department of Medical of Health Sciences Magna Graecia University Catanzaro Italy
11. Department of Pediatric Cardiology and Rheumatology Medical University of Lodz Lodz Poland
12. Institute for Maternal and Child Health, IRCCS Burlo Garofolo Trieste Italy
13. Pediatric Rheumatology Unit Shaare Zedek Medical Center, and Hebrew University Hadassah School of Medicine Jerusalem Israel
14. Servicio de Reumatología, Hospital de Niños Roberto Gilbert Elizalde Guayaquil Ecuador
15. Department of Pediatrics University Children's Hospital, Medical University of Vienna Vienna Austria
16. Division of Pediatrics, Department of Clinical and Experimental Medicine University of Pisa Pisa Italy
17. Clinica Pediatrica e Reumatologia, IRCCS Istituto Giannina Gaslini Genoa Italy