1. Center for Health Equity Research and Promotion; VA Pittsburgh Healthcare System; Pittsburgh PA USA
2. Department of Surgery; University of Pittsburgh School of Medicine; Pittsburgh PA USA
3. Division of Gastroenterology; VA Pittsburgh Healthcare System; Pittsburgh PA USA
4. Division of Gastroenterology, Hepatology, and Nutrition; University of Pittsburgh School of Medicine; Pittsburgh PA USA
5. Division of General Internal Medicine; University of Pittsburgh School of Medicine; Pittsburgh PA USA
6. VISN 4 Mental Illness Research and Clinical Center; VA Pittsburgh Healthcare System; Pittsburgh PA USA
7. RAND Corporation; Pittsburgh PA USA
8. Department of Psychiatry; University of Pittsburgh School of Medicine; Pittsburgh PA USA