1. Department of General Surgery and Medical Surgical Specialties – Section of Orthopaedics and Traumatology, University Hospital ‘Policlinico-Vittorio Emanuele’, University of Catania, Italy
2. IRCCS Istituto Ortopedico Galeazzi, Milan, Italy
3. Department of Paediatric Orthopaedic Surgery, Regina Margherita Children’s Hospital, Torino, Italy