[1] Duke Univ, Sch Med, Durham, NC USA
[2] Univ Calif San Francisco, Dept Med, Div Geriatr, San Francisco, CA 94143 USA
[3] Univ Calif San Francisco, Dept Psychiat & Behav Sci, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA USA
[5] Univ Calif San Francisco, Dept Med, Div Geriatr, Innovat & Implementat Ctr Aging & Palliat Care I, San Francisco, CA 94143 USA
[6] San Francisco Vet Affairs Hlth Care Syst, Res Serv, San Francisco, CA USA