1. Ferlay J Shin HR Bray F Forman D Mathers CD Parkin D GLOBOCAN 2008, Cancer Incidence and Mortality Worldwide: IARC CancerBase No. 10 Lyon, France International Agency for Research on Cancer http://globocan.iarc.fr
2. World Health Organization Databank WHO Statistical Information System Geneva World Health Organization http://www.who.int/whosis
3. Estimates of worldwide burden of cancer in 2008: GLOBOCAN 2008;Ferlay;Int J Cancer
4. United Nations Population Division World Population Prospects, the 2008 Revision New York United Nations http://www.un.org/