1. Food, Nutrition, Physical Activity, and the Prevention of Cancer. a Global Perspective. (2007). https://discovery.ucl.ac.uk/4841/1/4841.pdf.
2. Epidemiology of colorectal cancer;Janout V;Biomed Pap Med Fac Univ Palacku Olomouc Czech Repub,2001
3. SEER cancer statistics review, 1975-2005;Ries L AG;Bethesda, MD,2008
4. Colorectal cancer in the young;O'Connell JB;Am J Surg,2004
5. Incidence and current trends of colorectal malignancies in an unscreened, low risk Pakistan population;Bhurgri Y;Asian Pac J Cancer Prev,2011