1. From the Russell H. Morgan Department of Radiology and Radiological Sciences (P.P., A.P., Y.L., M.A.G., P.K., S.Z., I.R.K.) and the Departments of Medicine, Division of Gastroenterology and Hepatology (A.M.O.L., M.C., M.S.G.), Pathology (R.H.H., M.S.G.), and Surgery, Division of Surgical Oncology (C.W.), Johns Hopkins University School of Medicine, 600 N Wolfe St, Room 143, Baltimore, MD 21287.