1. From the Department of Radiological Sciences (J.J.Y., M.P.) and Division of Digestive Diseases (L.H.), University of California Los Angeles, Ronald Reagan UCLA Medical Center, Los Angeles, Calif; and Department of Radiological Sciences, Olive View–UCLA Medical Center, 14445 Olive View Dr, Sylmar, CA 91342 (A.P., C.M.J., M.N., M.D., S.F.M.).