1. Department of Gastroenterology, Hepatology, and Motility, David Grant Medical Center, Fairfield, California, USA;
2. Department of Medicine, USUHS, Clinical Faculty, UC Davis, Davis, California, USA;
3. Department of Medicine, University of Mississippi Medical Center, Baptist GI, Jackson, Mississippi, USA;
4. Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA.