Current Concepts

From the Departments of Medicine, Divisions of Gastroenterology and Hepatology, Mayo Medical School, Rochester, Minn., and the University of Alabama, Birmingham (T.H.B.); and the Department of Radiology, University of Alabama, Birmingham (D.E.M.). Address reprint requests to Dr. Baron at the Division of Gastroenterology and Hepatology, Mayo Clinic, 200 First St. SW, Rochester, MN 55905, or at [email protected].