1. Hamburg Centre for Pediatric and Adolescent Rheumatology, Schön Klinik Hamburg Eilbek, Hamburg, Germany
2. German Rheumatism Research Center, Berlin, Germany
3. Children’s Hospital of Pittsburgh, Pittsburgh, PA, USA
4. Department of Pediatric Rheumatology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
5. University Children’s Hospital, Riga, Latvia
6. Universidade Federal de São Paulo, Sao Paulo, Brazil
7. Scientific Center of Children’s Health, Moskva, Russia
8. Hospital de Pediatria, Buenos Aires, Argentine
9. Meyer Children’s Hospital, Florence, Italy
10. Federal State Autonomous Institution “National Medical Research Center of Children’s Health” of the Ministry of Health of the Russian Federation, Moscow, Russia
11. Hospital for Special Surgery, New York, NY, USA
12. University Hospital Ramón y Cajal, Madrid, Spain
13. Department of Internal Medicine, Ghent University, Ghent, Belgium
14. Universidade do Estado, Rio de Janeiro, Brazil
15. University Children’s Hospital Ljubljana, Ljubljana, Slovenia
16. Serviço de Reumatologia, Hospital Garcia de Orta, Almada, Portugal
17. Pediatric Rheumatology, University Tübingen, Tübingen, Germany
18. Department of Pediatrics and Adolescent Medicine, University Childrens Hospital, Prague, Czech Republic
19. Hospital de Niños Dr. Orlando Alassia, Santa Fee, Argentine
20. Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
21. Pediatric Rheumatology, Sri Ramachandra University, Chennai, India
22. Division of Rheumatology and Clinical Immunology, Charité University Medicine, Berlin, Germany
23. Hospital Sant Joan de Déu Barcelona, Barcelona, Spain
24. Rigshospitalet, Copenhagen, Denmark
25. Meir Medical Center, Tel Aviv University, Kfar Saba, Israel