1. Cincinnati Children’s Hospital Medical Center and University of Cincinnati Cincinnati Ohio
2. Université de Paris Institut IMAGINE Centre de référence national pour les Rhumatismes inflammatoires et les maladies Auto‐Immunes Systémiques rares de l’Enfant Hôpital Necker‐Enfants Malades AP‐HP Paris France
3. Federal State Autonomous Institution National Medical Research Center of Children's Health of the Ministry of Health of the Russian Federation Federal State Autonomous Educational Institution of Higher Education I. M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation Moscow Russia
4. Semmelweis University Budapest Hungary
5. Centre de Référence des Maladies Auto‐Inflammatoires rares et des Amyloses CHU de Biĉetre AP‐HP University of Paris Sud Paris France
6. Children's Hospital of Los Angeles Los Angeles California
7. University of Toronto and Hospital for Sick Children Toronto Ontario Canada
8. Wilhelmina Children’s Hospital Utrecht The Netherlands
9. Saint‐Petersburg State Pediatric Medical University Saint‐Petersburg Russia
10. The Edmond and Lily Safra Children's Hospital Ramat Gan Israel
11. Charité University Medicine Berlin and Leibniz Institut Berlin Germany
12. University Hospital Tuebingen Tuebingen Germany
13. Universitair Ziekenhuis Leuven and Katholieke Universiteit Leuven Leuven Belgium
14. Université catholique de Louvain and Cliniques Universitaires Saint‐Luc Brussels Belgium
15. VA Nasonova Research Institute of Rheumatology Moscow Russia
16. Hippokration General Hospital and Thessaloniki University School of Medicine Thessaloniki Greece
17. P&A Kyriakou Children's Hospital and Athens University School of Medicine Athens Greece
18. Università degli Studi di Genova Genoa Italy
19. Biometrical Practice BIOP Basel Switzerland
20. Novartis Pharma Basel Switzerland
21. IRCCS Istituto Giannina Gaslini Clinica Pediatrica e Reumatologia PRINTO Genoa Italy