[1] Georgetown Univ, Sch Med, Dept Emergency Med, Washington, DC USA
[2] Brown Univ, Alpert Med Sch, Dept Emergency Med, Providence, RI USA
[3] Univ Washington, Dept Emergency Med, Seattle, WA USA
[4] Wayne State Univ, Dept Emergency Med, Detroit, MI USA
[5] Ohio State Univ, Dept Emergency Med, Coll Med, Columbus, OH USA
[6] Emory Univ, Dept Emergency Med, Atlanta, GA USA
[7] Univ Calif Los Angeles, David Geffen Sch Med, Dept Emergency Med, Los Angeles, CA USA
[8] Georgetown Univ, Dept Emergency Med, Sch Med, 4917 Hine Dr, Shady Side, MD 20764 USA