[1] Albert Einstein Coll Med, Beth Israel Med Ctr, Dept Emergency Med, New York, NY USA
[2] Washington Univ, Sch Med, Div Emergency Med, Barnes Jewish Hosp, St Louis, MO USA
[3] Univ Massachusetts, Sch Med, Dept Emergency Med, Worcester, MA USA
[4] Carolinas Med Ctr, Dept Emergency Med, Charlotte, NC 28203 USA
[5] Christiana Care Hlth Syst, Dept Emergency Med, Newark, DE USA
[6] N Shore Univ Hosp, Dept Emergency Med, Manhasset, NY USA
[7] Duke Univ, Med Ctr, Div Emergency Med, Durham, NC USA