[1] Univ Michigan, VA Ann Arbor, Inst Healthcare Policy & Innovat, Ann Arbor, MI 48105 USA
[2] Yale Sch Med, Dept Emergency Med, New Haven, CT USA
[3] NewYork Presbyterian Columbia Univ, Irving Med Ctr, Dept Pediat, New York, NY USA
[4] Amer Coll Emergency Phys, Dallas, TX USA
[5] Yale Univ, Sch Med, Dept Emergency Med & Pediat, New Haven, CT USA
[6] Yale Sch Med, Ctr Outcomes Res & Evaluat, New Haven, CT USA