1. Department of Allergology, Rheumatology, and Clinical Immunology, University Children's Hospital
2. Department of Pediatrics, Meyer Hospital, University of Florence, Florence, Italy
3. Division of Rheumatology, SickKids Hospital, University of Toronto, Toronto, Ontario, Canada
4. Department of Autoimmune Diseases, Hospital Clinic, University of Barcelona, Catalonia, Spain
5. Pediatria II, Istituto G. Gaslini, Genoa, Italy
6. Department of Pediatrics, University of Genoa, Genoa, Italy
7. Rheumatology Unit, Hospital Sor Maria Ludovica, La Plata, Buenos Aires, Argentina
8. Safra Children's Hospital, Sheba Medical Center, Tel-Hashomer, Israel
9. Department of Pediatrics, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
10. Rheumatology Section, Adolescent Health Care Unit, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
11. Department of Pediatric Rheumatology, Universade de Estado do Rio de Janeiro, Rio de Janeiro, Brazil, Unigranrio, Brazil
12. Department of Pediatrics, Division of Rheumatology, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
13. Department of Pediatrics, Botucatu Medical School, Sao Paulo State University, Botucatu, Brazil
14. Department of Pediatric Sciences, Universita’ Cattolica Sacro Cuore, Rome, Italy
15. Department of Rheumatology, University Medical Center, Ljubljana, Slovenia
16. Department of Internal Medicine, University of Milan, Milan, Italy
17. Allergy, Clinical Immunology, and Rheumatology Unit, San Luca Hospital, IRCCS Istituto Auxologico Italiano, Milan, Italy