[1] Univ Vermont, Med Ctr, Dept Emergency Med & Pediat, Burlington, VT 05401 USA
[2] Univ Vermont, Childrens Hosp, Larner Coll Med, Burlington, VT 05401 USA
[3] Northwestern Univ, Ann & Robert H Lurie Childrens Hosp Chicago, Feinberg Sch Med, Dept Pediat, Chicago, IL USA
[4] Emory Univ, Sch Med, Childrens Healthcare Atlanta, Dept Pediat & Emergency Med, Atlanta, GA USA
[5] Univ Michigan Ann Arbor, CS Mott Childrens Hosp, Sect Pediat Surg, Ann Arbor, MI USA
[6] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med, Dept Pediat, Philadelphia, PA USA
[7] Harvard Med Sch, Dept Pediat, Boston, MA USA
[8] Harvard Med Sch, Dept Emergency Med, Boston, MA USA
[9] Boston Childrens Hosp, Div Emergency Med, Boston, MA USA
[10] George Washington Univ, Childrens Natl Hosp, Dept Pediat, Washington, DC USA
[11] Childrens Hosp Assoc, Lenexa, KS USA
[12] Univ Arkansas Med Sci, Sect Hosp Med, Dept Pediat, Little Rock, AR USA
[13] Univ Calif Los Angeles, UCLA Semel Inst Neurosci & Human Behav, Los Angeles, CA USA
[14] Med Coll Wisconsin, Comprehens Injury Ctr, Dept Emergency Med, Milwaukee, WI USA
[15] Univ Vermont, Larner Coll Med, Dept Emergency Med, Fletcher House 301,111 Colchester Ave, Burlington, VT 05401 USA