[1] Maimonides Hosp, Dept Emergency Med, Brooklyn, NY 11219 USA
[2] Jackson Mem Hlth Syst, Dept Emergency Med, Miami, FL USA
[3] Rush Univ, Dept Emergency Med, Med Ctr, Chicago, IL 60612 USA
[4] Univ Virginia, Sch Med, Dept Emergency Med, Charlottesville, VA 22908 USA
[5] Harbor UCLA Med Ctr, Dept Emergency Med, Torrance, CA 90509 USA
[6] Brooke Army Med Ctr, Res, SAUSHEC, Emergency Med, Ft Sam Houston, TX 78234 USA