1. Torre LA, Bray F, Siegel RL, Ferlay J, Lortet-Tieulent J, Jemal A (2015) Global cancer statistics, 2012. CA Cancer J Clin 65:87–108
2. Ferlay J, Shin HR, Bray F, Forman D, Mathers C, Parkin DM (2010) Estimates of worldwide burden of cancer in 2008: GLOBOCAN 2008. Int J Cancer 127:2893–2917
3. Ferlay J, Sorjomataram I, Ervik M et al (2013) GLOBOCAN 2012 v 1.0, Cancer incidence and mortality worldwide: IARC CancerBase No. 11. International Agency for Research on Cancer, Lyon, France. http://globocan.iarc.fr . Accessed 18 Jan 2016
4. Macrae FA (2015) Colorectal cancer: epidemiology, risk factors, and protective factors. Wolters Kluwer, UpToDate. http://www.uptodate.com/contents/colorectal-cancer-epidemiology-risk-factors-and-protective-factors . Accessed 18 Jan 2016
5. Boyle P, Langman JS (2000) ABC of colorectal cancer: epidemiology. BMJ 321:805–808