1 Division of Gastroenterology, Hepatology and Nutrition, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania; Center for Health Equity Research Promotion, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.
2 Section of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, Texas.
3 Section of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, Texas; US Department of Veterans Affairs, Veterans Health Administration, Health Services Research and Development Service at the Center for Innovations in Quality, Effectiveness and Safety, Michael E. DeBakey VA Medical Center, Houston, Texas.