[1] Nemours Childrens Hosp, Dept Med Imaging, Orlando, FL 32827 USA
[2] Harvard Univ, Sch Med, Massachusetts Gen Hosp, Sect Pediat Imaging,Dept Radiol, Boston, MA 02114 USA
[3] Harvard Univ, Sch Med, Massachusetts Gen Hosp, Sect Abdominal Imaging & Intervent,Dept Radiol, Boston, MA 02114 USA
[4] Univ Penn, Perelman Sch Med, Childrens Hosp Philadelphia, Dept Radiol, Philadelphia, PA 19104 USA
[5] Boston Childrens Hosp, Dept Radiol, Div Thorac Imaging, Boston, MA 02115 USA
[6] Harvard Univ, Sch Med, Boston, MA 02115 USA
[7] Univ Penn, Perelman Sch Med, Childrens Hosp Philadelphia, Div Body Imaging,Dept Radiol, Philadelphia, PA 19104 USA