1 Department of Medicine, Baylor College of Medicine, Houston, Texas.
2 Section of Gastroenterology and Hepatology, Baylor College of Medicine, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas; Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas; Section of Health Services Research, Department of Medicine, Baylor College of Medicine, Houston, Texas; Texas Medical Center Digestive Disease Center, Houston, Texas; Dan L. Duncan Cancer Center, Houston, Texas.