[1] Wake Forest Univ, Bowman Gray Sch Med, Dept Emergency Med, Winston Salem, NC 27109 USA
[2] Emory Sch Med, Dept Emergency Med, Atlanta, GA USA
[3] Duke Univ, Dept Surg, Div Emergency Med, Durham, NC USA
[4] Univ Florida, Dept Emergency Med, Jacksonville, FL USA
[5] Rush Med Coll, Dept Emergency Med, Chicago, IL 60612 USA
[6] Metrohlth Med Ctr, Cleveland, OH USA
[7] Univ New Mexico, Dept Emergency Med, Albuquerque, NM 87131 USA
[8] Albany Med Ctr, Dept Emergency Med, Albany, NY USA