1. Section of Epidemiology and Population Sciences, Department of Medicine, Baylor College of Medicine
2. Department of Medicine
3. Department of Molecular Virology and Microbiology, Michael E DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
4. Section of Gastroenterology and Hepatology, Department of Medicine
5. School of Medicine, Baylor College of Medicine, Houston, Texas, USA
6. Center for Innovations in Quality, Effectiveness and Safety (IQuESt), Michael E DeBakey Veterans Affairs Medical Center, Houston, Texas, USA
7. Dan L Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas, USA