Affiliations

• ¹ Division of Gastroenterology and Hepatology, Department of Medicine, Stanford University, Stanford, California.
• ² Division of Gastroenterology, Hepatology and Nutrition, Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
• ³ Veterans Administration Puget Sound Health Care System, Division of Gastroenterology, Department of Medicine, University of Washington School of Medicine, Seattle, Washington.
• ⁴ Division of Gastroenterology and Hepatology, Oregon Health and Sciences University, Portland, Oregon.