1. Pediatric Rheumatology Unit, Department of Childhood and Developmental Medicine, Fatebenefratelli-Sacco Hospital, Piazzale Principessa Clotilde, 20121 Milano, Italy
2. Department of Pediatrics, Meyer Children’s Hospital, 50139 Firenze, Italy
3. Faculty of Medicine and Psycology, Sapienza University of Rome—NESMOS Department, Sant’Andrea University Hospital, Via Grottarossa 1035-1039, 00189 Roma, Italy