[1] Univ Rochester, Dept Emergency Med, Sch Med, 601 Elmwood Ave,Box 655, Rochester, NY 14642 USA
[2] Univ Rochester, Dept Pediat, Sch Med, 601 Elmwood Ave,Box 655, Rochester, NY 14642 USA
[3] Univ Maryland, Dept Emergency Med, Sch Med, 110 S Paca St,6th Floor,Suite 200, Baltimore, MD 21201 USA