1. Department of Paediatric Rheumatology, Wilhelmina Children's Hospital, Utrecht, The Netherlands
2. Department of Paediatric Rheumatology, Sophia Children's Hospital, Erasmus University Medical Centre, Rotterdam, The Netherlands
3. Department of Paediatric Rheumatology, Alder Hey Children's NHS Foundation Trust, Liverpool, UK
4. Department of Paediatric Rheumatology, Hacettepe University, Ankara, Turkey
5. Department of Paediatric Rheumatology, Great Ormond Street Hospital for Children, London, UK
6. Department of Paediatric Rheumatology, University Children's Hospital Ljubljana, Ljubljana, Slovenia
7. Department of Paediatric Rheumatology, Necker Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
8. First Faculty of Medicine, Charles University and General University Hospital, Prague, Czech Republic
9. Department of Paediatric Rheumatology, The Hospital for Sick Children, University of Toronto, Toronto, Canada
10. Department of Paediatric Rheumatology, Bicêtre Hospital, APHP, University of Paris SUD, Paris, France
11. Department of Paediatric Rheumatology, Hospital for Children and Adolescents, University of Helsinki, Helsinki, Finland
12. Department of Paediatric Rheumatology, Gaslini Children's Hospital, Genoa, Italy
13. Meir Medical Centre, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
14. Institute of Translational Medicine, University of Liverpool, Liverpool, UK