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