1. Department of Medicine Surgery and Neurosciences, University of Siena, Siena, Italy
2. Section of Orthopedics, Azienda Ospedaliero-Universitaria Senese, Siena, Italy
3. Second Clinic of Orthopedic and Traumatology, University of Pisa, Pisa, Italy
4. Section of Orthopedic Oncology and Reconstructive Surgery, Azienda Ospedaliero-Universitaria Careggi, Firenze, Italy