[1] Univ Missouri, Truman Med Ctr, Kansas City Sch Med, Dept Emergency Med, Kansas City, MO 64108 USA
[2] Univ Med & Dent New Jersey, New Jersey Med Sch, Dept Emergency Med, Newark, NJ 07103 USA
[3] UCSF, Dept Emergency Med, Fresno Med Educ Program, Fresno, CA USA
[4] Brown Univ, Rhode Isl Hosp, Dept Emergency Med, Alpert Med Sch, Providence, RI 02903 USA
[5] Maricopa Cty Gen Hosp, Dept Emergency Med, Phoenix, AZ USA