http://www.cancer.gov/cancer_information/doc.aspx?viewid=D5D1DF96-C862-43AF-86BC-F80466B57966
National Cancer Institute, National Institutes of Health
This up-to-date information from the National Cancer Institute's PDQ® database is intended for use by patients. The document presents an general overview of colorectal cancer screening methods and screening effectiveness and discusses colorectal cancer prevention.