[1] Rush Univ, Med Ctr, Dept Emergency Med, 1750 West Harrison St,Suite 108 Kellogg, Chicago, IL 60612 USA
[2] Univ Michigan, Dept Surg, Ann Arbor, MI 48109 USA
[3] Univ Saskatchewan, Dept Emergency Med, Saskatoon, SK, Canada
[4] McMaster Univ, Off Continuing Profess Dev, Hamilton, ON, Canada
[5] McMaster Univ, Dept Med, Div Emergency Med, Hamilton, ON, Canada