1. a Department of Internal Medicine , University of Milan , Milan , Italy
2. b Geriatric Medicine Outpatient Service, Urban Outpatient Services, Istituti Clinici di Perfezionamento Hospital , Milan , Italy
3. c Rehabilitation Unit, ASP IMMeM e Pio Albergo Trivulzio , Milan , Italy
4. d Geriatric Medicine Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico , Milan , Italy