1 Division of Gastroenterology, Leonard Davis Institute for Health Economics, University of Pennsylvania, Center for Evidence-Based Practice, University of Pennsylvania Health System, Philadelphia, Pennsylvania.
2 Vatche & Tamar Manoukian Division of Digestive Diseases, University of California Los Angeles, UCLA Kaiser Permanente Center for Health Equity, Division of Gastroenterology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California.