1. Department of Medicine, Surgery and Neurosciences, University of Siena, 53100 Siena, Italy
2. Section of Orthopedics, Azienda Ospedaliero-Universitaria Senese, 53100 Siena, Italy
3. Orthopedics and Trauma Surgery Unit, Department of Ageing, Neurosciences, Head-Neck and Orthopedics Sciences, Fondazione Policlinico Universitario Agostino Gemelli IRCCS, 00168 Rome, Italy