Affiliation: | 1. Division of Gastroenterology, Minneapolis Veterans Affairs Health Care System, Minneapolis, Minnesota;2. Department of Medicine, University of Minnesota School of Medicine, Minneapolis, Minnesota;3. Division of Biostatistics, University of Minnesota School of Public Health, Minneapolis, Minnesota;4. Division of Pathology, University of Minnesota School of Medicine, Minneapolis, Minnesota;5. Division of Environmental Health Sciences, University of Minnesota School of Public Health, Minneapolis, Minnesota;1. Department of Internal Medicine and Division of Gastroenterology and Hepatology;2. Department of Anatomic Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota |