[1] Univ Southern Calif, Keck Sch Med, Dept Emergency Med, Clin Emergency Med, Los Angeles, CA 90033 USA
[2] Univ Washington, Sch Med, Dept Biomed Informat & Med Educ, Seattle, WA USA
[3] Univ Washington, Sch Med, Dept Emergency Med, Seattle, WA USA
[4] McMaster Univ, Fac Hlth Sci, Dept Med, Hamilton, ON, Canada
[5] McMaster Univ, Fac Hlth Sci, Hlth Profess Educ Res, Hamilton, ON, Canada
[6] Univ Calif San Francisco, Sch Med, Dept Emergency Med, Emergency Med, San Francisco, CA USA