Institution: | 1. Section of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine and Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas;3. Department of Internal Medicine, Baylor College of Medicine, Houston, Texas;4. Section of Epidemiology and Population Sciences, Department of Medicine, Baylor College of Medicine, Houston, Texas;6. Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas |