1. Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, FL, USA
2. Clinical Studies Unit, Mayo Clinic, Jacksonville, FL, USA
3. Division of Community Internal Medicine, Mayo Clinic, Jacksonville, FL, USA
4. Department of Radiology, Mayo Clinic, Jacksonville, FL, USA
5. Division of Community Internal Medicine, Mayo Clinic, Rochester, MN, USA
6. Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA