1. Pediatric Unit II
2. Department of Pediatrics
3. Department of Pediatrics, Pediatric Immunology and Rheumatology Unit, Spedali Civili and University of Brescia, Brescia, Italy
4. Department of Pediatrics, University of Padua, Padua, Italy
5. Department of Medicine, Division of Rheumatology, Pediatric Hospital of the Child Jesus, Rome, Italy
6. Department of Medical and Surgical Pediatric Sciences, Section of Pediatric Rheumatology, Hospital Worker University Gaetano Martino, Messina, Italy
7. Department of Pediatrics, Scientific Institute for Treatment and Research Burlo Garofolo, University of Trieste, Trieste, Italy
8. Department of Reproductive Medicine and Development, University of Pisa, Pisa, Italy
9. Department of Pediatrics, Rheumatology Unit, Anna Meyer Children's Hospital and University of Florence, Florence, Italy
10. Department of Human Genetics, Galliera Hospital, Genoa, Italy
11. Laboratory of Molecular Genetics, Giannina Gaslini Institute, Genoa, Italy
12. Department of General Pediatrics, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, Netherlands
13. Biostatistics Unit, Department of Health Sciences, University of Genoa, Genoa, Italy