[1] Childrens Hosp Philadelphia, Dept Anesthesiol & Crit Care Med, Philadelphia, PA 19104 USA
[2] Childrens Hosp Philadelphia, Ctr Simulat Adv Educ & Innovat, Philadelphia, PA USA
[3] Duke Univ, Med Ctr, Dept Pediat, Div Pediat Crit Care Med,Duke Childrens Hosp, Durham, NC 27710 USA
[4] Harvard Univ, Brigham & Womens Hosp, Dept Emergency Med, Sch Med, Boston, MA 02115 USA