[1] Emergency Nurses Assoc, Schaumburg, IL USA
[2] Northwestern Univ, Feinberg Sch Med, Dept Emergency Med, Chicago, IL USA
[3] Brown Univ, Dept Emergency Med, Providence, RI USA
[4] Baylor Coll Med, Dept Emergency Med, Houston, TX USA
[5] Vajira Hosp, Dept Emergency Med, Bangkok, Thailand
[6] Brigham & Womens Hosp, Dept Emergency Med, Boston, MA USA
[7] Columbia Univ, Dept Emergency Med, Coll Phys & Surg, New York, NY USA
[8] Harvard Med Sch, Massachusetts Gen Hosp, Dept Emergency Med, Boston, MA USA
[9] Northwestern Univ, Dept Emergency Med, 211 E Ontario St,200, Chicago, IL 60611 USA