[1] Brooke Army Med Ctr, Dept Emergency Med, Ft Sam Houston, TX 78234 USA
[2] Dalhousie Med New Brunswick, Dept Otolaryngol, St John, NB, Canada
[3] Univ Ottawa, Dept Emergency Med, Ottawa, ON, Canada
[4] Dalhousie Med New Brunswick, Dept Emergency Med, St John, NB, Canada