[1] Univ Wisconsin, Sch Med & Publ Hlth, BerbeeWalsh Dept Emergency Med, Madison, WI 53705 USA
[2] Massachusetts Gen Hosp, Brigham & Womens Hosp, Harvard Affiliated Emergency Med Residency, Boston, MA USA
[3] Univ Washington, Dept Emergency Med, Seattle, WA USA
[4] Johns Hopkins Univ, Sch Med, Dept Emergency Med, Baltimore, MD USA
[5] Rowan Univ, Cooper Med Sch, Dept Emergency Med, Camden, NJ USA
[6] Stanford Univ, Sch Med, Dept Emergency Med, Palo Alto, CA USA
[7] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Emergency Med, Boston, MA USA
[8] Univ Illinois, Dept Med Educ, Chicago, IL USA
[9] Harvard Med Sch, Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA USA