1. From the Department of Diagnostic Radiology (B.M.C., K.K.J., B.R.F.) and Department of Medicine, Division of Gastroenterology (B.K.E.), Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, Portland, OR 97239; Portland Gastroenterology Center, Portland, Maine (G.B.); and Department of Radiology and Imaging Sciences, University of Utah, Salt Lake City, Utah (A.M.S.).