1. Asklepios Hospital Weissenfels Weissenfels Germany
2. Universitario Severo Ochoa Madrid Spain
3. University of Nis Nis Serbia
4. IRCCS Ospedale Pediatrico Bambino Gesù Rome Italy
5. National Institute of Rheumatology and Physiotherapy Budapest Hungary
6. MC Groep Lelystad The Netherlands
7. Instituto Nacional de Rehabilitación Mexico City Mexico
8. Hospital General Universitario Gregorio Marañón and Complutense University Madrid Spain
9. ASST Mantova, C. Poma Hospital Mantua Italy
10. Pediatric Rheumatology Research Institute Bad Bramstedt Germany
11. Università degli Studi di Torino Turin Italy
12. APHPHôspital Ambroise Paré, 92100 Boulogne‐Billancourt, INSERM U1173, UFR Simone Veil, and Versailles‐Saint‐Quentin University Saint‐Quentin en Yvelines France