1. Ferlay J, Soerjomataram I, Dikshit R, Eser S, Mathers C, Rebelo M, et al. Cancer incidence and mortality worldwide: Sources, methods and major patterns in GLOBOCAN 2012. International Journal of Cancer. 2015;36:E359-E386. DOI: 10.1002/ijc.29210
2. Steward B, Wild CP, editors. International Agency for Research on Cancer, WHO. World Cancer Report 2014 [Online]. 2014. Available from: http://www.thehealthwell.info/node/725845 [Accessed: April 21, 2018]
3. World Cancer Factsheet. Vol. 381. 2012. London: Cancer Research UK. Available from: www.thelancet.com [Accessed: February 9, 2013]
4. WHO. Available from: http://www.who.int/mediacentre/factsheets/fs297/en/ [Consulted on April 16, 2018]
5. Jemal A, Bray F, Center MM, Ferlay J, Ward E, Forman D. Global cancer statistics. CA: A Cancer Journal for Clinicians. 2011;61(2):69-90. DOI: 10.3322/caac.20107