1. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, Minnesota
2. Department of Internal Medicine, Cleveland Clinic, Cleveland, Ohio
3. Department of Internal Medicine, Columbia University Irving Medical Center and the Vagelos College of Physicians and Surgeons, New York, New York
4. Department of Radiology, Mayo Clinic, Rochester, Minnesota
5. Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
6. Department of Quantitative Health Sciences, Mayo Clinic, Rochester, Minnesota
7. Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
8. Department of Gastroenterology and Hepatology, University of Texas MD Anderson, Houston