1. Department of Medicine, University of Wisconsin School of Medicine and Public Health, 1685 Highland Avenue, Madison, Wisconsin 53705
2. Department of Radiology, University of Wisconsin School of Medicine and Public Health, E3/366 Clinical Science Center, 600 Highland Avenue, Madison, Wisconsin 53792
3. Digestive Endoscopy Unit, Nuovo Regina Margherita Hospital, via E Morosini, 30, 00153, Rome, Italy
4. Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Health, 3170 UW Medical Foundation Centennial Building, 1685 Highland Avenue, Madison, Wisconsin 53705
5. University of Wisconsin Carbone Cancer Center, 600 Highland Avenue, Madison, Wisconsin 53792
6. Division of Gastroenterology and Hepatology, University of Wisconsin School of Medicine and Public Health, 1685 Highland Avenue, Madison, Wisconsin 53705