[1] Brown Univ, Dept Pediat, Providence, RI 02912 USA
[2] Brown Univ, Div Pediat Cardiol, Providence, RI 02912 USA
[3] Brown Univ, Hasbro Childrens Hosp, Warren Alpert Med Sch, Providence, RI 02912 USA
[4] Rhode Isl Hosp, Dept Diagnost Imaging, Providence, RI USA