[1] Northwestern Univ, Div Emergency Med, Feinberg Sch Med, Ann & Robert H Lurie Childrens Hosp Chicago, Chicago, IL 60611 USA
[2] Univ Penn, Perelman Sch Med, Div Emergency Med, Philadelphia, PA 19104 USA
[3] Childrens Hosp Philadelphia, Ctr Simulat Adv Educ & Innovat, Philadelphia, PA 19104 USA
[4] Univ Louisville, Dept Bioinformat & Biostat, Louisville, KY 40292 USA
[5] Univ Penn, Perelman Sch Med, Div Crit Care & Emergency Med, Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA