1. Cancer prevention & early detection: facts and figures 2008;American Cancer Society,2008
2. Health Pages. Available from: http://www.thehealthpages.com/articles/ar-colon.html [accessed 21.05.06].
3. Colorectal cancer prevention & early detection: facts and figures 2008–2010;American Cancer Society,2008
4. Annual report to the nation on the status of cancer, 1975–2005, featuring trends in lung cancer, tobacco use and tobacco control;Jemal;J Natl Cancer Inst,2008
5. American Cancer Society. American Cancer Society guidelines on screening and surveillance for the early detection of adenomatous polyps and colorectal cancer. Reprinted from CA Cancer J Clin 2008;58. Available from: http://www.cancer.org/docroot/CRI/content/CRI_2_4_3x_Can_Colon_and_rectum_cancer_be_found_early.asp [accessed 22.01.09].