Joseph C Anderson1,2,3, Joel B Levine3,4. 1. Department of Veterans Affairs Medical Center, White River Junction, VT. 2. Geisel School of Medicine at Dartmouth, Hanover, NH. 3. Division of Gastroenterology and Hepatology and Colon Cancer Prevention Program, University of Connecticut School of Medicine, Farmington, CT. 4. Colon Cancer Prevention Program, Neag Cancer Center.