[1] Childrens Hosp Philadelphia, Div Radiol, 3401 Civ Ctr Blvd, Philadelphia, PA 19104 USA
[2] New York Presbyterian Hosp, Weill Cornell Med Coll, New York, NY USA
[3] Ochsner Clin Fdn, New Orleans, LA USA
[4] Univ Chicago, Dept Radiol, Chicago, IL 60637 USA
[5] Univ Southern Calif, Keck Sch Med, Dept Radiol, Los Angeles, CA 90033 USA
[6] NYU, Dept Radiol, Langone Med Ctr, 560 1St Ave, New York, NY 10016 USA