1 Department of Geriatrics and Orthopedics, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy.
2 Department of Geriatrics and Orthopedics, Università Cattolica del Sacro Cuore, Largo Francesco Vito 1, 00168 Rome, Italy; Fondazione Policlinico Universitario Agostino Gemelli IRCCS, Largo Agostino Gemelli 8, 00168 Rome, Italy. Electronic address: emanuele.marzetti@policlinicogemelli.it.