[1] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med, Dept Anesthesiol & Crit Care Med, Philadelphia, PA USA
[2] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med, Dept Med Ethics, Philadelphia, PA USA
[3] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med, Dept Pediat, Philadelphia, PA USA
[4] Univ Penn, Childrens Hosp Philadelphia, Perelman Sch Med, Dept Neurol, Philadelphia, PA USA