[1] Emory Univ, Dept Med, Div Gen Med & Geriatr, 49 Jesse Hill Jr Dr, Atlanta, GA 30303 USA
[2] Univ Calif San Francisco, Dept Med, Div Gen Internal Med, San Francisco, CA USA
[3] Univ Calif San Francisco, Dept Psychiat, San Francisco, CA USA
[4] Kaiser Permanente Northern Calif Reg, Div Res, Oakland, CA USA