[1] Stanford Univ, Sch Med, Dept Med, Stanford Ctr Res Dis Prevent, Palo Alto, CA 94304 USA
[2] Stanford Univ, Sch Med, Dept Hlth Res & Policy, Div Epidemiol, Palo Alto, CA 94304 USA
[3] Univ Miami, Sch Med, Ctr Geriatr Res Educ & Clin, Miami, FL USA
[4] Vet Adm, Miami, FL USA
[5] Univ Delaware, Dept Psychol, Newark, DE USA