1. Department of General Surgery and Medical Surgical Specialties, Section of Orthopaedics and Traumatology, University Hospital Policlinico-Vittorio Emanuele, University of Catania, Catania, Italy
2. Pediatric Orthopaedic Department, Purpan Hospital, Toulouse University Centre, Toulouse, France
3. Pediatric Orthopedic Surgery Department, “Vittore Buzzi” Children’s Hospital, Milan, Italy
4. Orthopaedic Department, Olga Hospital, Stuttgart, Germany
5. Department of Pediatric Orthopedic Surgery, Jeanne de Flandre Hospital, Lille University Centre, Lille, France