[1] Columbia Univ, Dept Emergency Med, Div Pediat Emergency Med, Irving Med Ctr, New York, NY 10032 USA
[2] Albert Einstein Coll Med, Montefiore Med Ctr, Dept Emergency Med, Bronx, NY USA
[3] Albert Einstein Coll Med, Childrens Hosp Med Ctr, Dept Pediat, Div Pediat Emergency Med, Bronx, NY USA
[4] Columbia Univ, Dept Emergency Med, Div Pediat Emergency Med, Med Ctr, 3959 Broadway, New York, NY 10032 USA