[1] Santa Maria Annunziata Hosp, Local Hlth Unit Toscana Ctr, Geriatr Unit, Florence, Italy
[2] Univ Florence, Azienda Osped Univ Careggi, Careggi Hosp, Div Geriatr & Intens Care Med, Largo Brambilla 3, I-50139 Florence, Italy
[3] Univ Florence, Dept Hlth Sci, Florence, Italy
[4] Local Hlth Unit Toscana Ctr, Epidemiol Unit, Florence, Italy
[5] San Giovanni Dio Hosp, Dept Internal Med, Florence, Italy
[6] Careggi Hosp, Div Internal Med, Florence, Italy
[7] Dept Terr Hlth Network, Florence, Italy
[8] Santa Maria Nuova Hosp, Local Hlth Unit Toscana Ctr, Dept Internal Med, Florence, Italy