[1] Univ Calif Los Angeles, Robert Wood Johnson Fdn Clin Scholars Program, Los Angeles, CA 90024 USA
[2] Univ Calif Los Angeles, US Dept Vet Affairs, Los Angeles, CA USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[4] Univ Calif Los Angeles, Jonathan & Karin Fielding Sch Publ Hlth, Los Angeles, CA USA
[5] Univ Calif Los Angeles, Ctr Emergency Med, Los Angeles, CA 90024 USA
[6] RAND Corp, Santa Monica, CA USA
[7] Mt Sinai Med Ctr, Dept Emergency Med, New York, NY 10029 USA