[1] Brooke Army Med Ctr, Dept Emergency Med, 3841 Roger Brooke Dr, Ft Sam Houston, TX 78234 USA
[2] Univ Virginia, Dept Emergency Med, Sch Med, Charlottesville, VA 22903 USA
[3] Univ Texas Southwestern Med Ctr Dallas, Dept Emergency Med, 5323 Harry Hines Blvd, Dallas, TX 75390 USA
[4] Rush Univ, Dept Emergency Med, Med Ctr, Chicago, IL 60612 USA