[1] Brigham & Womens Hosp, Div Abdominal Imaging & Intervent, Dept Radiol, 75 Francis St, Boston, MA 02115 USA
[2] Univ Calif Los Angeles, David Geffen Sch Med, Div Abdominal Imaging & Intervent, Dept Radiol, 757 Westwood Plaza, Los Angeles, CA 90095 USA
[3] Univ Wisconsin, Div Abdominal Imaging & Intervent, Dept Radiol, 600 Highland Ave, Madison, WI 53792 USA