[1] Harbor UCLA Med Ctr, Dept Emergency Med, Torrance, CA 90509 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Med, Los Angeles, CA 90095 USA
[3] Univ Iowa Hosp & Clin, Dept Emergency Med, Emergency Med, Iowa City, IA 52242 USA
[4] Oregon Hlth & Sci Univ, Dept Emergency Med, Portland, OR 97201 USA
[5] Brown Univ, Alpert Med Sch, Emergency Med, Providence, RI 02912 USA
[6] Univ Colorado, Sch Med, Dept Emergency Med, Clin Skills Fdn Doctoring Course, Aurora, CO USA
[7] Univ Michigan, Sch Med, Educ Res & Qual Improvement, Ann Arbor, MI USA
[8] Univ Michigan, Dept Emergency Med, Ann Arbor, MI 48109 USA
[9] Univ Michigan, Dept Learning Hlth Sci, Ann Arbor, MI 48109 USA
[10] Penn State Hershey Med Ctr, Hershey, PA USA
[11] Harbor UCLA Med Ctr, Dept Emergency Med, Residency Training Program, Torrance, CA 90509 USA
[12] Univ Calif Los Angeles, David Geffen Sch Med, Acute Care Coll, Med, Los Angeles, CA 90095 USA
[13] Univ Calif Los Angeles, David Geffen Sch Med, Acute Care Coll, Los Angeles, CA 90095 USA