1. Orthopedics Department, University Hospital of Siena, Siena, Italy
2. University of Siena, Siena, Italy
3. Department of Anesthesia and Cardiothoracic Vascular Intensive Therapy, University Hospital of Siena; Siena, Italy
4. Medical Biotechnologies Department, University of Siena, Siena, Italy
5. Orthopedics and Traumatology Department, University Hospital of Siena, Siena, Italy