[1] Cedars Sinai Med Ctr, Div Gen Internal Med, Los Angeles, CA 90048 USA
[2] Pardee RAND Grad Sch, Santa Monica, CA USA
[3] UCLA, David Geffen Sch Med, Div Gen Internal Med & Hlth Serv Res, Los Angeles, CA USA
[4] UCLA, Dept Hlth Policy & Management, Fielding Sch Publ Hlth, Los Angeles, CA USA