[1] IRCCS, S Giovanni di Dio FBF, Brescia, Italy
[2] NIA, Clin Res Branch, Longitudinal Studies Sect, Baltimore, MD 21224 USA
[3] Univ Naples 2, Dept Geriatr Med & Metab Dis, Naples, Italy
[4] INRCA, Dept Geriatr, Lab Clin Epidemiol, Florence, Italy
[5] IRCCS, S Giovanni di Dio FBF, Alzheimers Unit, Brescia, Italy
[6] NIA, Lab Epidemiol Demog & Biometry, Bethesda, MD 20892 USA
[7] IRCCS, S Giovanni di Dio FBF, Lab Epidemiol & Neuroimaging, Brescia, Italy