[1] Baylor College of Medicine,Section of Gastroenterology and Hepatology and Clinical Epidemiology and Comparative Effectiveness Program in the Health Services Research, Michael E. DeBakey VA Medical Center
[2] Baylor College of Medicine,Clinical Epidemiology and Comparative Effectiveness Program, Section of Health Services Research (IQuESt), Michael E. DeBakey VA Medical Center
[3] Texas Medical Center Digestive Disease Center,undefined
[4] Dan L Duncan Comprehensive Cancer Center at Baylor College of Medicine,undefined