1. Università degli Studi di Genova; Genoa Italy
2. IRCCS G. Gaslini; Genoa Italy
3. Karolinska University Hospital Solna; Stockholm Sweden
4. Ospedale Pediatrico A. Meyer; Florence Italy
5. Hospital Ramon y Cajal; Madrid Spain
6. Albert Einstein College of Medicine and Children's Hospital at Montefiore; Bronx New York
7. AP-HP, Centre Hospitalier Universitaire Le Kremlin Bicêtre; Le Kremlin Bicêtre France
8. Universidade Federal do Rio de Janeiro; Rio de Janeiro Brazil
9. University of California, Los Angeles and Mattel Children's Health Center UCLA; Los Angeles California
10. Universidade de São Paulo; São Paulo Brazil
11. Hospital Universitario Pedro Ernesto; Rio de Janeiro Brazil
12. University of Athens Medical School and Children's Hospital Aghia Sofia; Athens Greece
13. Dokuz Eylül University Medical School; Izmir Turkey
14. New Jersey Medical School and Hackensack University Medical Center; Hackensack New Jersey
15. Wilhelmina Children's Hospital and University Medical Center Utrecht; Utrecht The Netherlands
16. Great North Children's Hospital; Newcastle UK
17. Sanjay Gandhi Postgraduate Institute of Medical Sciences; Lucknow India
18. Universidad Católica de Córdoba; Córdoba Argentina
19. Hospital de Cruces; Bilbao Spain
20. Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico; Milan Italy
21. Hospital General de Ninos Pedro de Elizalde; Buenos Aires Argentina
22. Ospedale Pediatrico G. Salesi Ancona; Ancona Italy
23. Hadassah-Hebrew University Medical Center; Jerusalem Israel
24. Tripoli Children's Hospital; Tripoli Libya
25. IRCCS Materno Infantile Burlo Garofolo; Trieste Italy
26. Children's Hospital University Clinical Center Sarajevo; Sarajevo Bosnia and Herzegovina
27. Juliane Marie Centret and Rigshospitalet; Copenhagen Denmark
28. Emory University and Children's Healthcare of Atlanta; Atlanta Georgia
29. Università Cattolica del Sacro Cuore; Roma Italy
30. Riga Stradins University; Riga Latvia
31. Mount Sinai Medical Center; Miami Beach Florida
32. Institute of Rheumatology; Belgrade Serbia
33. Kagoshima University Hospital; Kagoshima Japan
34. Helios Kliniken Berlin; Berlin Germany
35. IRCCS G. Gaslini and Università degli Studi di Genova; Genoa Italy
36. University of Alabama at Birmingham