1. Office of Public Health/Population Health Program; Veterans Affairs Palo Alto Health Care System; Palo Alto CA USA
2. Department of Medicine; Veterans Affairs Palo Alto Health Care System; Palo Alto CA USA
3. Division of Gastroenterology and Hepatology; Veterans Affairs Palo Alto Health Care System; Palo Alto CA USA
4. Division of Gastroenterology and Hepatology; Stanford University; Stanford CA USA