[1] UCLA, David Geffen Sch Med, Div Gen Internal Med & Hlth Serv Res, Dept Med, 1100 Glendon Ave,Suite 850, Los Angeles, CA 90278 USA
[2] UCSF Ctr Vulnerable Populat, UCSF Div Gen Internal Med, Zuckerberg San Francisco Gen Hosp, San Francisco, CA USA
[3] Harbor UCLA Med Ctr, Los Angeles Cty Dept Hlth Serv, Los Angeles, CA USA
[4] Univ Colorado, Div Gen Internal Med, Sch Med, Aurora, CO USA
[5] San Francisco Hlth Network, Off Hlth Informat, San Francisco, CA USA