[1] Univ Colorado, Sch Med, Dept Emergency Med, Aurora, CO USA
[2] Partners HealthCare Syst, Clin & Qual Anal, Boston, MA USA
[3] Brigham & Womens Hosp, Div Gen Med & Primary Care, 75 Francis St, Boston, MA 02115 USA
[4] Brigham & Womens Hosp, Dept Emergency Med, 75 Francis St, Boston, MA 02115 USA
[5] Univ Colorado, Sch Med, Dept Internal Med, Aurora, CO USA
[6] Harvard Med Sch, Boston, MA 02115 USA
[7] Brandeis Univ, Waltham, MA USA
[8] Univ Colorado, Sch Med, Childrens Hosp Colorado, Aurora, CO USA