1. Asklepios Klinik Sankt Augustin, Sankt Augustin, Germany, and University of Cologne Cologne Germany
2. University of Cologne Cologne Germany
3. German Rheumatism Research Centre Berlin, Berlin and Charité University Medicine Berlin Germany
4. Olga Hospital Stuttgart Germany
5. St. Josef‐Stift Sendenhorst Sendenhorst Germany
6. Hamburg Centre for Pediatric and Adolescent Rheumatology Hamburg Germany
7. German Centre for Pediatric and Adolescent Rheumatology Garmisch‐Partenkirchen Germany
8. Children's Hospital Sankt Georg Leipzig Germany
9. Prof. Hess Children's Hospital Bremen Germany
10. Hanover Medical School Hanover Germany
11. University Hospital Tuebingen Tübingen Germany
12. University Hospital Düsseldorf Düsseldorf Germany
13. University Children's Hospital Münster Münster Germany
14. Helios Klinik Berlin‐Buch Berlin Germany
15. Clementine Children's Hospital Frankfurt Germany