1 Department of Geriatrics, Neurosciences and Orthopaedics, Università Cattolica del Sacro Cuore, Rome, Italy; IRCCS Fondazione Don Carlo Gnocchi, Milan, Italy. Electronic address: luca.padua@unicatt.it.
2 Neuroriabilitazione ad Alta Intensità, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.
3 IRCCS Fondazione Don Carlo Gnocchi, Milan, Italy.