1. Division of Digestive and Liver Diseases; Department of Internal Medicine; University of Texas Southwestern Medical Center; Dallas TX USA
2. Division of Emergency Medicine; Departments of Psychiatry and Surgery; VA North Texas Health Care System; University of Texas Southwestern Medical Center; Dallas TX USA
3. Division of Infectious Diseases; Department of Internal Medicine; University of Texas Southwestern Medical Center; Dallas TX USA
4. Department of Clinical Sciences; University of Texas Southwestern Medical Center; Dallas TX USA