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 A. Gemelli IRCCS, Università Cattolica del Sacro Cuore, 00168 Rome, Italy