Affiliation: | 1. Division of Gastroenterology and Hepatology, Department of Medicine, University of Virginia, Charlottesville, Virginia;3. Division of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, Texas;4. Gastroenterology Section, VA San Diego Healthcare System, San Diego, California;6. Interventional Radiology, Radiology and Imaging Sciences, National Institutes of Health, Washington, DC |