[1] Univ Colorado, Ctr Bioeth & Humanities, Anschutz Med Campus,13080 E 19th Ave,Room 201E, Aurora, CO 80045 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Div Gen Internal Med & Hlth Serv Res, Los Angeles, CA 90095 USA
[3] Fielding UCLA Sch Publ Hlth, Ctr Publ Hlth & Disasters, Los Angeles, CA USA
[4] Johns Hopkins Bloomberg Sch Publ Hlth, Ctr Hlth Secur, Baltimore, MD USA
[5] George Washington Univ, Dept Emergency Med, Washington, DC USA