1. Pediatric Orthopedic Unit, Piccole Figlie Hospital, Parma, Italy
2. Department of Orthopedics, ASST Ospedale Papa Giovanni XXIII, Bergamo, Italy
3. Pathology Unit, San Raffaele Scientific Institute, Vita-Salute San Raffaele University, Milan, Italy
4. IRCCS Istituto Ortopedico Rizzoli, 1st Orthopaedics and Traumatologic Clinic, Bologna, Italy
5. Department of Biomedical and Neuromotor Sciences (DIBINEM), Alma Mater Studiorum University of Bologna, Bologna, Italy