[1] Univ Chicago, Dept Med, Sect Emergency Med, Chicago, IL USA
[2] Ohio State Univ, Dept Emergency Med, 777a Prior Hall,376 W 10th Ave, Columbus, OH 43210 USA
[3] Univ Wisconsin, Sch Med & Publ Hlth, BerbeeWalsh Dept Emergency Med, Madison, WI USA
[4] Northwestern Univ, Feinberg Sch Med, Dept Emergency Med, Chicago, IL USA
[5] Yale Sch Med, Dept Emergency Med, New Haven, CT USA
[6] Wake Forest Univ, Bowman Gray Sch Med, Dept Emergency Med, Winston Salem, NC USA
[7] US Acute Care Solut, Dept Emergency Med, Summa Hlth Syst, Akron, OH USA
[8] US Acute Care Solut, Canton, OH USA