1. Asklepios Clinic Sankt Augustin; Sankt Augustin Germany
2. Hamburg Center for Pediatric Rheumatology; Hamburg Germany
3. Charité University Hospital Berlin; Berlin Germany
4. HELIOS Clinic Berlin-Buch; Berlin Germany
5. University Children's Hospital Tuebingen; Tuebingen Germany
6. RWTH Aachen University; Aachen Germany
7. St. Josef-Stift Sendenhorst Hospital; Sendenhorst Germany
8. Prof.-Hess Children's Hospital and Gesundheit Nord Klinikverbund Bremen; Bremen Germany