[1] GRECC, VA Palo Alto Hlth Care Syst, Palo Alto, CA USA
[2] Stanford Univ, Sch Med, Dept Psychiat & Behav Med, Stanford, CA 94305 USA
[3] Stanford Univ, Sch Med, Dept Gen Internal Med, Stanford, CA 94305 USA
[4] Stanford Univ, Sch Med, Dept Gerontol, Stanford, CA 94305 USA
[5] Stanford Univ, Sch Med, Dept Geriatr Med, Stanford, CA 94305 USA