[1] Rush Univ, Med Ctr, Dept Pediat, Chicago, IL 60612 USA
[2] John H Stroger Jr Hosp Cook Cty, Chicago, IL 60612 USA
[3] Childrens Hosp Philadelphia, Dept Cardiol, Philadelphia, PA 19104 USA
[4] Johns Hopkins Univ, Combined Pediat & Anesthesiol Residency Program, Baltimore, MD USA
[5] Childrens Hosp Wisconsin, Milwaukee, WI USA