1. National Cancer Institute. (2004) SEER Cancer Statistics Review 1975-2001. August 2004. Available from: http://seer.cancer.gov/csr/1975-2001/sections.html.
2. United States cancer statistics: 2000 incidence;U. S. Cancer Statistics Working Group,2004
3. Free radicals and the etiology of colon cancer;Babbs;Free Radic Biol Med,1990
4. High levels of reactive oxygen metabolites in colon cancer tissue: analysis by chemiluminescence probe;Keshavarzian;Nutr Cancer,1992
5. Antioxidant potential in esophageal, stomach and colorectal cancers;Skrzydlewska;Hepatogastroenterology,2003