[1] Univ Chicago, Dept Emergency Med, Chicago, IL 60637 USA
[2] Univ N Carolina, Sch Med, Chapel Hill, NC USA
[3] Washington Univ, Div Emergency Med, St Louis, MO USA
[4] Univ N Carolina, Dept Emergency Med, Chapel Hill, NC 27514 USA
[5] Icahn Sch Med Mt Sinai, New York, NY 10029 USA
[6] Univ Wisconsin, Dept Emergency Med, Madison, WI USA
[7] John A Hartford Fdn, New York, NY USA
[8] Duke Univ, Dept Emergency Med, Durham, NC USA
[9] Univ N Carolina, Dept Anesthesiol, Chapel Hill, NC 27514 USA