1. From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Ro