[1] Univ Cincinnati, Dept Emergency Med, Cincinnati, OH USA
[2] George Washington Univ, Dept Emergency Med, Sch Med & Hlth Sci, Washington, DC USA
[3] Rush Univ, Dept Emergency Med, Med Ctr, Chicago, IL USA
[4] Virginia Commonwealth Univ, Sch Med, Dept Emergency Med, Richmond, VA USA
[5] George Washington Univ, Dept Hlth Human Funct & Rehabil Sci, Sch Med & Hlth Sci, Washington, DC USA
[6] Univ Cincinnati, Cincinnati, OH 45267 USA