1. Department of Surgery, University Hospital of Siena, Viale Bracci No. 16, 53100 Siena, Italy
2. Orthopaedics and Traumatology Clinic, University Hospital of Siena, Viale Bracci No. 16, 53100 Siena, Italy
3. Department of Internal Medicine, University Hospital of Siena, Viale Bracci No. 16, 53100 Siena, Italy