[1] INRCA, Sci Direct, I-60124 Ancona, Italy
[2] Univ Perugia, Dept Clin & Expt Med, Inst Gerontol & Geriatr, I-06100 Perugia, Italy
[3] Pfizer Italia, Natl & Reg Healthcare Affairs Dept, Rome, Italy
[4] Univ Florence, Dept Crit Care Med & Surg, Unit Gerontol & Geriatr, Florence, Italy
[5] Azienda Osped, Florence, Italy