1. IRCCS Istituto G. Gaslini Clinica Pediatrica e Reumatologia, UOSID Centro Trial, PRINTO Genova Italy
2. Cincinnati Children's Hospital Medical Center, University of Cincinnati Cincinnati Ohio
3. Universidad Nacional de Tucuman San Miguel de Tucumán Argentina
4. Hospital Star Medica Merida, Yuc Mexico
5. Asklepios Clinical Sankt Augustin, Sankt Augustin, Germany, and University of Cologne Cologne Germany
6. Universita di Napoli Napoli Italy
7. Duke University School of Medicine Durham North Carolina
8. Hôpital Femme Mère Enfant, CHU de Lyon Lyon France
9. Hospital General de México Mexico City Mexico
10. Hospital Universitario Ramón y Cajal Madrid Spain
11. Hospital das Clinicas HCFMUSP, Universidade de São Paulo São Paulo Brazil
12. Grupo Hospitalar Conceição Porto Alegre Brazil
13. Universidade Federal de São Paulo São Paulo Brazil
14. Connecticut Children's Medical Center Hartford
15. Bristol Myers Squibb Princeton New Jersey
16. Universita di Genova Genova Italy