[1] Yale Sch Med, Sect Pediat Emergency Med, Dept Pediat, New Haven, CT USA
[2] Yale Sch Med, Dept Emergency Med, New Haven, CT USA
[3] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[4] Yale New Haven Med Ctr, Pediat Emergency Dept, 20 York St, New Haven, CT 06504 USA